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R – Risk and Compliance Survey: we need your help! Copyright © 2020 | MH Corporate basic by MH Themes, rquery can perform this operation on database tables, Click here if you're looking to post or find an R/data-science job, Introducing our new book, Tidy Modeling with R, How to Explore Data: {DataExplorer} Package, R – Sorting a data frame by the contents of a column, Whose dream is this? x2 = letters[1:3], Let’s install and load data.table to RStudio: “X”) to the index of the column: select(Your_DF -1) . Do you need more explanations on the R programming codes of this article? dataFrame.iloc[ , ] It selects the columns and rows from DataFrame by index position specified in range. Subscribe to my free statistics newsletter. This approach also works for a matrix. Let’s first create the dataframe. This will return a string vector with the names of the dataframe. 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You can use these name to access specific columns by name without having to know which column number it is. To drop columns by index position, we first need to find out column names from index position and then pass list of column names to drop(). with the more recent releases, you need to use a different approach to get the dplyr rename column by index function to work. # Get ndArray of all column names. The RStudio console returns the value 1, i.e. Now, we can use these names to access specific columns by name without having to know which column number it is. I want to get the column index in which a given value is found. Pandas returns the names of columns as Pandas Index object. data) Then, we need to open some square brackets (i.e. Details. 2) but to remove a column by name in R, you can also use dplyr, and you’d just type: select(Your_Dataframe, -X). Let us first load Pandas. In addition, you may want to read the related tutorials of my homepage: At this point you should have learned how to identify the variable index based on its label in a data frame in the R programming language. yes but how? This means, when we define the first three columns of the pres_results data frame, year, state and total_votes, dplyr converts these names to the index values 1, 2 and 3. so can not use table.column.columnname. In this Pandas tutorial, we will learn 6 methods to get the column names from Pandas dataframe.One of the nice things about Pandas dataframes is that each column will have a name (i.e., the variables in the dataset). 8.4 Dataframe column names. Our DataFrame object dfObj is, Let us first load Pandas. We have wrapped base-R and data.table implementations into method a in rquery/rqdatatable here. In this tutorial we will be looking on how to get the list of column names in the dataframe with an example. I hate spam & you may opt out anytime: Privacy Policy. Elements from a vector, matrix, or data frame can be extracted using numeric indexing, or by using a boolean vector of the appropriate length. just to add another possibility: You can usually use grep and it's decedents (i.e., grepl, to do these kind of jobs in a more sophisiticated way using regular expressions.. On your example your could get the column index with: grep("^bar$", colnames(x)) or grep("^bar$", names(x)) The ^ and $ are meta characters for the beginning and end of a string, respectively. In this post we will see how to get the column names as a list. The extractor functions try to do something sensible for any matrix-like object x.If the object has dimnames the first component is used as the row names, and the second component (if any) is used for the column names. Columns Age & Name deleted . One of the nice things about dataframes is that each column will have a name. getting column's name. We call this trick a “pseudo aggregator”, and we often teach the technique in SQL (where it is often min() or max()). In this post we will see how to get the column names as a list. In this Section, I’ll explain how to identify variables with a complete match to a character string. Now, we can use these names to access specific columns by name without having to know which column number it is. As you can see based on Table 2, the previous R syntax extracted the columns x1 and x3. 8.4 Dataframe column names. In this tutorial, I’ll illustrate how to find the index of a column in a data frame in the R programming language. Get Column Names from a DataFrame object. If `row` is a 2-d array, this should not be given. DataTables stores the data for rows and columns in internal indexes for fast ordering, searching etc. Posted on September 20, 2018 by John Mount in R bloggers | 0 Comments. The previous R syntax can be explained as follows: First, we need to specify the name of our data set (i.e. Example 1: Print DataFrame Column Names. In each group the choice column is a constant, and data.table supplies the name of the group as a scalar in the variable named choice. What we are doing is grouping by “choice”. Required fields are marked *. The previous R syntax can be explained as follows: First, we need to specify the name of our data set (i.e. Step 2: Set a single column as Index in Pandas DataFrame. Suppose our goal is to build a new column called “derived” that for each row chooses from the column named by the names in the column called “choice”. You can change index / columns names (labels) of pandas.DataFrame by using rename(), add_prefix(), and add_suffix() or updating the index / columns attributes.. This lets us assign values from that column all at once (.SD, being data.table’s notation for the sub-data.table representing the group). Python Program When we use the select() function and define the columns we want to keep, dplyr does not actually use the name of the columns but the index of the columns in the data frame. # 2 2 b 5 DataFrame.columns. Maximum value of a column in R can be calculated by using max() function.Max() Function takes column name as argument and calculates the maximum value of that column. You can change index / columns names (labels) of pandas.DataFrame by using rename(), add_prefix(), and add_suffix() or updating the index / columns attributes.. 18 . Rows to subset by. data # Print example data x12 = 5) However, having the column names as a list is useful in many situation. Details. This means, when we define the first three columns of the pres_results data frame, year, state and total_votes, dplyr converts these names to the index values 1, 2 and 3. It's easier to remove variables by their position number. Example 2 explains how to search for columns partially matching a character string using the grep and colnames functions: grep("x1", colnames(data)) # Apply grep function Drop Columns by Index Position in DataFrame. Maximum of single column in R, Maximum of multiple columns in R using dplyr. For a data frame, rownames and colnames eventually call row.names and names respectively, but the latter are preferred. You’re here for the answer, so let’s get straight to the examples…, data <- data.frame(x1 = 1:3, # Example data get column index with match using apply Hi everyone, This is probably something very simple but I have just not been able to figure it out and wonder if perhaps you may know. The column-index is for internal use for the database. Dplyr package in R is provided with select() function which select the columns based on conditions. Finally, if you want to delete a column by index, with dplyr and select, you change the name (e.g. Table of contents: For example delete columns at index position 0 & 1 from dataframe object dfObj i.e. Then you may have a look at the following video of my YouTube channel. # rename column in r dplyr rename (new_field_name = old_field_name) You were previously able to directly use column index references in this package. Column names of an R Dataframe can be acessed using the function colnames (). For instance : df = data.frame(c1=c('a','b'),c2=c(1,2)) > df c1 c2 1 a 1 2 b 2 I would like to retrieve the column name which value is 2 (here, the column is c2) thanks for your help While in most part they column index will be the order the columns created, but they can change if you delete or insert columns. It is the basic object storing axis labels. The same methods can be used to rename the label of pandas.Series.. Get regular updates on the latest tutorials, offers & news at Statistics Globe. Instead of passing all the names in index or column list we can pass range also i.e. Description. You can access the column names of DataFrame using columns property. You will learn how to use the following functions: pull(): Extract column values as a vector. You can also access the individual column names using an index to the output of colnames () just like an array. The same methods can be used to rename the label of pandas.Series.. Renaming the column names/variable names can be done in multiple ways in R. However, this post will enable analyst to identify index numbers of rows and columns. []) Within these brackets, we need to write a comma to reflect the two dimensions of our data. df <- mydata[ -c(1,3:4) ] data) Then, we need to open some square brackets (i.e. It returns an object. In each group the choice column is a constant, and data.table supplies the name of the group as a scalar in the variable named choice. Get regular updates on the latest tutorials, offers & news at Statistics Globe. columns do not get associated names exactly like that. It can be useful at times to know what these indexes are, as they can be used for efficient selectors in the row(), column() and other API methods which use selectors. Example 3: Convert Row Names to Column with data.table Package. Extract first n characters of the column in R Method 1: In the below example we have used substr() function to find first n characters of the column in R. substr() function takes column name, starting position and length of the strings as argument, which will return the substring of the specific column … To change all the column names of an R Dataframe, use colnames () as shown in the following syntax colnames (mydataframe) = vector_with_new _names the variable with the variable name “x1” is at the first index position of our data frame. It returns an object. It works like this: Also, rquery can perform this operation on database tables! Hi, I 'd like to know how to retrieve a column name of a data frame. I hate spam & you may opt out anytime: Privacy Policy. It can be useful at times to know what these indexes are, as they can be used for efficient selectors in the row(), column() and other API methods which use selectors. This TechVidvan article is designed to help you in creating, accessing, and modifying data frame in R. Data frames are lists that have a class of “data frame”.They are a special case of lists where all the components are of equal length.. Python Program Another popular R package for data manipulation is the data.table package. Age City a 34 Sydeny b 30 Delhi c 16 New York DataFrame.iloc | Select Column Indexes & Rows Index … You want to get part of a data structure. Example 1: Print DataFrame Column Names. Nearest equivalent would be getting column index with HeaderText, and then using that index. Method #1: Changing the column name and row index using df.columns and df.index attribute. Note, in that example, you removed multiple columns (i.e. select(): Extract one or multiple columns as a data table. Table of contents: ... To retrieve a data frame slice with the two columns mpg and hp, we pack the column names in an index vector inside the single square bracket operator. In this Pandas tutorial, we will learn 6 methods to get the column names from Pandas dataframe.One of the nice things about Pandas dataframes is that each column will have a name (i.e., the variables in the dataset). It is the basic object storing axis labels. We can get the ndarray of column names from this Index object i.e. This post describes the following contents with sample code. What we are doing is grouping by “choice”. subset = dfObj.loc[ 'a' : 'c' ,'Age' : 'City' ] It will return a subset DataFrame with rows from a to c & columns from Age to City i.e. Select Rows & Columns by Name or Index in Pandas DataFrame using [ ], loc & iloc; How to get column names in Pandas dataframe; Decimal Functions in Python | Set 2 (logical_and(), normalize(), quantize(), rotate() … ) NetworkX : Python software package for study of complex networks; Directed Graphs, Multigraphs and Visualization in Networkx In this example, we get the dataframe column names and print them. Note that the rownames_to_column command adds the row_names column at the first index position of our data frame (in contrast to our R syntax of Example 1). In each group the choice column is a constant, and data.table supplies the name of the group as a scalar in the variable named choice. In this tutorial, we will learn how to change column name of R Dataframe. As you can see based on Table 2, the previous R syntax extracted the columns x1 and x3. You can access the column names using index. You can access the column names using index. You can use these name to access specific columns by name without having to know which column number it is. We’ll also show how to remove columns from a data frame. Learn r how to create data frame with column names reskilling it reshape wide data frame to long format in r using column name r sort columns of a data frame by vector column names stack data frame in r. Whats people lookup in this blog: R Data Frame Get Column Names; R Dataframe Select Column Names; R Data Frame Get Column Name By Index Another popular R package for data manipulation is the data.table package. Column names of an R Dataframe can be acessed using the function colnames().You can also access the individual column names using an index to the output of colnames() just like an array.. To change all the column names of an R Dataframe, use colnames() as shown in the following syntax You may use the following approach in order to set a single column as the index in the DataFrame: df.set_index('column') For example, let’s say that you’d like to set the ‘Product‘ column as the index. R Data Frame Get Column Name By Index viewframes June 2, 2019 Uncategorized No Comments Selecting multiple columns with loc can be achieved by passing column names to the second argument of note that the first example returns a series and second dataframe you can achieve single column by select columns of a data frame in r last name set as index on sample data frame Next, you’ll see how to change that default index. # 3 3 c 5. It can be also used to remove columns from the data frame. While analyzing the real datasets which are often very huge in size, we might need to get the rows or index names in order to perform some certain operations. This is because a data.frame is a special kind of list and not a special kind of matrix. Your email address will not be published. To access the names of a dataframe, use the function names(). This lets us assign values from that column all at once (.SD, being data.table’s notation for the sub-data.table representing the group). Let’s discuss how to get row names in Pandas dataframe . (In database terms this looks a lot like a variation of a controlled coalesce.). Method #1: Changing the column name and row index using df.columns and df.index attribute. # x1 x2 x12 Let’s see how to use it. Pandas returns the names of columns as Pandas Index object. To access the names of a dataframe, use the function names(). In this R tutorial, we will take a look at R data frames. []) Within these brackets, we need to write a comma to reflect the two dimensions of our data. DataFrame.columns. Get DataFrame Column Names. Of course you can query the indexes, but they don't mean much. Of course you can query the indexes, but they don't mean much. lw@zi 9-Aug-12 4:20am The object "col" in … In the video, I illustrate the R programming code of this tutorial. If ‘:’ is given in rows or column Index Range then all entries will be included for corresponding row or column. require(["mojo/signup-forms/Loader"], function(L) { L.start({"baseUrl":"mc.us18.list-manage.com","uuid":"e21bd5d10aa2be474db535a7b","lid":"841e4c86f0"}) }), Your email address will not be published. On this website, I provide statistics tutorials as well as codes in R programming and Python. An R tutorial on retrieving a collection of column vectors in a data frame with the single square operator. Let’s install and load data.table to RStudio: It is essentially the same trick as the data.table solution: break the problem into groups where the choice is not varying (allowing us to use scalar column specifiers to do the work). I’m Joachim Schork. Get the column index of the selected column. DataFrame object has an Attribute columns that is basically an Index object and contains column Labels of Dataframe. However, having the column names as a list is useful in many situation. For a data frame, rownames and colnames eventually call row.names and names respectively, but the latter are preferred. These may be numeric indices, character names, a logical mask, or a 2-d logical array col The columns to index by. Select Data Frame Column Using Character Vector, Return Column Name of Largest Value for Each Row, Find Index of Maximum & Minimum Value of Vector & Data Frame Row, Print Entire tibble to R Console (2 Examples), Find Common Elements from Multiple Vectors in R (Example), Add and Subtract Days to from Date in R (2 Examples), Return Value from R Function (3 Examples). Columns Age & Name deleted . Select Rows & Columns by Name or Index in Pandas DataFrame using [ ], loc & iloc; How to get column names in Pandas dataframe; Decimal Functions in Python | Set 2 (logical_and(), normalize(), quantize(), rotate() … ) NetworkX : Python software package for study of complex networks; Directed Graphs, Multigraphs and Visualization in Networkx I'd do it so that I'd use TemplateField's with Literals or Labels, and use FindControl to locate them on specific row, so that column … To drop columns by index position, we first need to find out column names from index position and then pass list of column names to drop(). the column names at the first and third index position contain the character pattern “x1”. In many of the examples, below, there are multiple ways of doing the same thing. Indexing with numbers and names… # 1 3. We recently saw a great recurring R question: “how do you use one column to choose a different value for each row?” That is: how do you use a column as an index? Get the column index of the selected column. Get Column Index in Data Frame by Variable Name in R (2 Examples) In this tutorial, I’ll illustrate how to find the index of a column in a data frame in the R programming language. $ is not valid as part of the data set (or frame) name since R uses it to denote column name (:)) so R actually tried to get the column name 'data' from the data frame named 'model' Try: Note that whereas [2] would be the second element in a matrix, it refers to the second column in a data.frame. $ is not valid as part of the data set (or frame) name since R uses it to denote column name (:)) so R actually tried to get the column name 'data' from the data frame named 'model' Try: var index = table.columns().names().indexOf( 'Salary' ); // Note that this could also be done using `column().index()` and a name selector Related The following options are directly related and may also be useful in your application development. Let’s examine how to sort the contents of a data frame by the value of a column > numPeople = 10 > sex=sample(c("male","female"),numPeople,replace=T) > age = sample(14:102, numPeople, replace=T) > income = sample(20:150, numPeople, replace=T) > minor = age. DataTables stores the data for rows and columns in internal indexes for fast ordering, searching etc. This post describes the following contents with sample code. While in most part they column index will be the order the columns created, but they can change if you delete or insert columns. # 1 1 a 5 In this example, we get the dataframe column names and print them. One of the nice things about dataframes is that each column will have a name. x1 and x12). All you just need to do is to mention the column index number. Description. Hello. The column of interest can be specified either by name or by index. columnsNamesArr = dfObj.columns.values. You can also use the column name to get values. Solution. We will use Pandas coliumns function get the names of the columns. Get Column Index in Data Frame by Variable Name in R (2 Examples) In this tutorial, I’ll illustrate how to find the index of a column in a data frame in the R programming language. Please let me know in the comments section, in case you have additional questions. This last statement might look surprising if you’re used to Java or a traditional programming language. In our case the result would be “[1, 6, 3, NA]” (the last value being “NA” as “z” is not a column of df). On your example your could get the column index with: grep ("^bar$", colnames (x)) or grep ("^bar$", names (x)) The ^ and $ are meta characters for the beginning and end of a string, respectively. What is going on: is we are reducing the choice column to a series of scalars- so we can then use the scalar column selection operators (such as “[[]]”) to access columns. value Provide a an empty vector of some type to specify the type of the output. In the following code, we are telling R to drop variables that are positioned at first column, third and fourth columns. To get the list of column names of dataframe in R we use functions like names() and colnames(). Note that the rownames_to_column command adds the row_names column at the first index position of our data frame (in contrast to our R syntax of Example 1). The column-index is for internal use for the database. You can usually use grep and it's decedents (i.e., grepl, to do these kind of jobs in a more sophisiticated way using regular expressions. i want to find column in datarow not in table. which(colnames(data) == "x1") # Apply which function When and how to use the Keras Functional API, Moving on as Head of Solutions and AI at Draper and Dash. Let’s see how to calculate Maximum value in R … Renaming the column names/variable names can be done in multiple ways in R. However, this post will enable analyst to identify index numbers of rows and columns. When we use the select() function and define the columns we want to keep, dplyr does not actually use the name of the columns but the index of the columns in the data frame. © Copyright Statistics Globe – Legal Notice & Privacy Policy, Example 1: Extract Column Index of Variable with Exact Match, Example 2: Extract Column Indices of Variables with Partial Match. We will use Pandas coliumns function get the names of the columns. These are some ideas that will eventually be expanded and make it into our theory of coordinatized data (please also see here) and Practical Data Science in R 2nd Edition. Let’s discuss how to get row names in Pandas dataframe . Drop Columns by Index Position in DataFrame. Example 3: Convert Row Names to Column with data.table Package. # 1. This will return a string vector with the names of the dataframe. Some discussion of the ideas can be found here. Try col=max.col(data) This should give you the index of the column with the max value. Get DataFrame Column Names. var index = table.columns().names().indexOf( 'Salary' ); // Note that this could also be done using `column().index()` and a name selector Related The following options are directly related and may also be useful in your application development. This lets us assign values from that column all at once (.SD, being data.table’s notation for the sub-data.table representing the group). The RStudio console returns the numbers 1 and 3, i.e. Please read on for some idiomatic base R, data.table, and dplyr solutions. While analyzing the real datasets which are often very huge in size, we might need to get the rows or index names in order to perform some certain operations. Data structure value is found name and row index using df.columns and df.index.! And AI at Draper and Dash to know which column number it is statement might look surprising if you to... Well as codes in R … Details r get column name by index care to deal with mis-matches if ` `!: Extract one or multiple columns ( i.e 0 & 1 from object! Entries will be looking on how to get the column names for some idiomatic base R, Maximum of column... Programming code of this article it works like this: also, rquery perform. Pandas dataframe each column will have a look at the first and third position! Labels of dataframe using columns property by name or r get column name by index index, with dplyr select. Specific columns by name without having to know how to retrieve a column of. R – Risk and Compliance Survey: we need to specify the (... A dataframe, use the following video of my YouTube channel array, this should give you index... @ zi 9-Aug-12 4:20am the object `` col '' in … getting column index with HeaderText and. Not a special kind of matrix you change the name of a frame. First column, third and fourth columns you removed multiple columns in R, r get column name by index multiple. Idiomatic base R, Maximum of multiple columns ( i.e R to drop variables are! Additional questions the RStudio console returns the names in Pandas dataframe: the column-index is for internal use for database... How to get row names in Pandas dataframe internal indexes for fast ordering, searching etc that... [ ] ) Within these brackets, we need to do is to mention the column index which. Of dataframe individual column names in Pandas dataframe column in R bloggers | 0 comments this website, 'd. 2: set a single column as index in which a given value is found columns a. This should give you the index of the columns that whereas [ 2 would... Select, you removed multiple columns ( i.e the ndarray of column names as a list –.: set a single column as index in which a given value is found Pandas. The names of the dataframe column names as a list is useful in many situation the. Will have a name to write a comma to reflect the two of! Explained as follows: first, we can get the dplyr rename column by index tutorial will! Instead of passing all the names in Pandas dataframe website, I illustrate the programming. Would be the second column in datarow not in Table ’ is in! Delete columns at index position 0 & 1 from dataframe object dfObj i.e read on for some idiomatic base,! Respectively, but the latter are preferred RStudio: the column-index is for internal use for database. Colnames ( ) tutorials, offers & news at Statistics Globe logical mask, or a 2-d array, should... Things about dataframes is that each column will have a look at the following with! Data frame some extra care to deal with mis-matches & 1 from dataframe has... And then using that index open some square brackets ( i.e function #:... X1 ” by “ choice ” Extract column values as a vector give you index! The variable with the variable with the names in Pandas dataframe open some square (... With data.table package, note, in that example, we need to do is to mention the index... Select, you removed multiple columns as Pandas index object i.e Maximum of multiple columns in indexes. Can pass Range also i.e but the latter are preferred x1 ” there are multiple ways of doing same. One of the columns x1 and x3 or multiple columns in internal indexes for fast ordering, etc. Empty vector of some type to specify the name ( e.g column list we can use these to... “ X ” ) to the output third and fourth columns you will learn how to use the function (... Some idiomatic base R, Maximum of multiple columns in internal indexes for fast ordering, searching etc be as... Dataframe using columns property interest can be specified either by name without having to know which column it... Range also i.e: first, we can pass Range also i.e mask, or a traditional programming.... Data ) then, we can use these names to access specific columns by name having! First, we are telling R to drop variables that are positioned at first,... Is given in rows or column list we can use these names to access specific columns by name having! Programming language ) == `` x1 '' ) # Apply which function # 1: Changing the name... A look at the first and third index position contain the character pattern “ x1 ” is the... X ” ) to the index of the column names in index or column index number Maximum! The comments Section, I provide Statistics tutorials as well as codes in,. Index object and contains column Labels of dataframe with a complete match to a character string x1. Can access the column r get column name by index of a dataframe, use the function names ( ) like. The R programming code of this article ) matches two columns ( i.e well! Is some extra care to deal with mis-matches I illustrate the R programming Python. On this website, I illustrate the R programming codes of this?... Look surprising if you ’ ll also show how to use r get column name by index function colnames ). Perform this operation on database tables just like an array in index or column R ….! Apply which function # 1: Changing the column names of a dataframe, use function... Column will have a name spam & you may opt out anytime: Privacy.. Same methods can be also used to rename the label of pandas.Series and! To know which column number it is object has an attribute columns is! Max value empty vector of some type to specify the name ( e.g know to... Range then all entries will be looking on how to use a different approach get. The label of pandas.Series internal indexes for fast ordering, searching etc explanations on the latest tutorials offers... Rstudio: the column-index is for internal use for the database, data.table, and dplyr solutions equivalent be! Indices, character names, a logical mask, or a 2-d logical array col columns! To the index of the examples, below, there are multiple ways of doing same! Need to open some square brackets ( i.e collection of column names in comments! Offers & news at Statistics Globe ( 1,3:4 ) ] get dataframe column names in the Section! Names of the columns name of our data set ( i.e in datarow not in Table their! Delete columns at index position of our data set ( i.e object i.e because a data.frame of. Set ( i.e & you may have a look at R data frames the... Should give you the index of the column names as a list is useful in many of the things! Number it is value 1, i.e the database know how to part... ) function which select the columns x1 and x3 function colnames ( data ),! Dataframe with an example object dfObj i.e syntax can be found here data frame, should. Column values as a list using the function names ( ): Extract or! The latter are preferred | 0 comments column, third and fourth columns dplyr package in R using dplyr a. Many situation R data frames Apply which function # 1: Changing the column of... Method a in rquery/rqdatatable here in rquery/rqdatatable here in many situation Draper and Dash column 's name or! For example delete columns at index position 0 & 1 from dataframe object has an attribute columns that basically! Get the names of dataframe using columns property then you may have a name change name. ( i.e match to a character string “ x1 ” ( partially ) matches two columns (.. Discussion of the column index in which a given value is found like a of... We get the names of columns as Pandas index object and contains column Labels of dataframe using columns.. Statistics tutorials as well as codes in R using dplyr return a string vector with the variable name “ ”! Is the data.table package the previous R syntax can be found here that default index r get column name by index mydata [ -c 1,3:4. You need more explanations on the latest tutorials, offers & news at Statistics Globe for corresponding or. Lw @ zi 9-Aug-12 4:20am the object `` col '' in … getting column 's name Maximum value in …. Syntax extracted the columns based on conditions change that default index and contains column Labels of using. Labels of dataframe using columns property last statement might look surprising if ’! These may be numeric indices, character names, a logical mask, or a 2-d array! Can pass Range also i.e rows and columns in internal indexes for fast ordering, searching etc 3! String vector with the more recent releases, you ’ ll see how to retrieve a column index... Pull ( ) just like an array identify variables with a complete match to character!: the column-index is for internal use for the database removed multiple columns (.. Load data.table to RStudio: the column-index is for internal use for database... Extra care to deal with mis-matches approach to get the dataframe row or index!

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