How to Handle "undefined columns selected" in R? Last Updated : 28 Nov, 2021 Summarize Comments Improve Suggest changes Share Like Article Like Report In this article, we will discuss how to handle "undefined columns selected" error in R Programming Language. This error is specific to dataframe in R. This type of error will occur when we select a subset of a data frame and forget to add a comma. Example: Check the error in the dataframe Here we created a dataframe with 3 columns and select the values in which the second column value is greater than 45 R # create dataframe with 4 rows and 3 columns data = data.frame(marks1=c(98, 90, 89, 78), marks2=c(100, 89, 91, 76), marks3=c(78, 89, 79, 94)) # display print(data) # now select values from marks2 column # which are greater than 45 data[data$marks1 > 45] Output: This is because of neglecting comma(,) behind the value. The dataframe must choose the column after comma operator. So we have to keep comma. Example: R # create dataframe with 4 rows and # 3 columns data = data.frame(marks1=c(98, 90, 89, 78), marks2=c(100, 89, 91, 76), marks3=c(78, 89, 79, 94)) # display print(data) # now select values from marks2 column # which are greater than 90 data[data$marks1 > 90, ] Output: Comment More infoAdvertise with us Next Article Select Subset of DataTable Columns in R G gottumukkala_sivanagulu Follow Improve Article Tags : R Language R-DataFrame Similar Reads How to Fix: Error in select unused arguments in R? In this article, we will be looking toward the approach to fix the error in selecting unused arguments in the R programming language. Error in selecting unused arguments: The R compiler produces this error when a programmer tries to use the select() function of the dplyr package in R provided that t 2 min read Select variables (columns) in R using Dplyr In this article, we are going to select variables or columns in R programming language using dplyr library. Dataset in use: Select column with column name Here we will use select() method to select column by its name Syntax: select(dataframe,column1,column2,.,column n) Here, data frame is the input 5 min read How to Fix: Unexpected String Constant in R An unexpected string constant: The compiler produces such an error when we use the quotation marks in the incorrect place in R. The error might occur in the below three different scenarios. Example 1: Â When a file is imported. Let us consider an example in which we try to import a colon-delimited fi 2 min read Select Subset of DataTable Columns in R In this article, we will discuss how to select a subset of data table columns in R programming language. Let's create a data table using a matrix. First, we need to load data.table package in the working space. Installation install.packages("data.table") Â Â Â Â Â Â Â Â Â Â Â Â Â Loading library("dat 2 min read How to Handle table Error in R R Programming Language is commonly used for data analysis, statistical modeling, and visualization. However, even experienced programmers make blunders while dealing with R code. Error management is critical for ensuring the reliability and correctness of data analysis operations. Common causes of t 2 min read How to Remove a Column using Dplyr package in R In this article, we are going to remove a column(s) in the R programming language using dplyr library. Dataset in use: Remove column using column nameHere we will use select() method to select and remove column by its name. Syntax: select(dataframe,-column_name) Here, dataframe is the input datafram 3 min read Like