Blog

In R, if you are missing mathematical operators when performing mathematical operations, you can raise the error: attempt to apply non-function. This error occurs because the R interpreter expects a function whenever you place parentheses () after a variable name. You...

If you try to subset a data frame without using a comma, you will raise the error: undefined columns selected. The syntax for subsetting a data frame is: dataframe[rows_to_subset, columns_to_subset] To solve this error, you need to use a comma after the rows you want...

In R, if the evaluation of a condition in an if or while statement results in NA, you will raise the error: missing value where TRUE/FALSE needed. You can solve this error by using is.na(x) instead of x == NA. This tutorial will go through the error in detail and how...

If you try to refer to an object that has not been defined in an R code block or before it, you will raise the error object not found. The R interpreter could not find the variable mentioned in the error message. You can check if a variable exists using ls or exists,...

This error occurs when you try to read a CSV file into R using read.table() and do not specify the correct separator. You can solve this error by specifying the sep argument for the read.table() function call. For example, df <- read.table("pizzas.csv",...

If you try to access a column or row that does not exist, you will raise the error Subscript out of bounds. You can use nrows(matrix) to find the number of rows of a matrix, ncol(matrix) to find the number of columns in a matrix and dim(matrix) to find the number of...

If you try to index a function using square brackets [] or the dollar sign operator $, you will raise the error: object of type 'closure' is not subsettable. This error typically occurs when using square brackets to subset a function mistaken for a subsettable object...

If you try to read a CSV file in R but the file name or directory that the file is in does not exist, you will raise the Error in file(file, "rt") cannot open the connection. If the file does exist, you can either change your working directory to location of the file...

If you try to use the rbind() to row bind two data frames with mismatching column names, you will raise the error names do not match previous names. You can solve this error by renaming the columns of one of the data frames to match the other using the names()...