by Suf | May 2, 2022 | Programming, R, Tips
If you want to use the call a function on the data frame or matrix column using apply(), you must use a data frame or matrix as the first argument. If you use a column of the data frame or matrix, you will raise the error: dim(X) must have a positive length. You can...
by Suf | May 2, 2022 | Programming, R, Tips
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...
by Suf | May 2, 2022 | Programming, R, Tips
If you try to merge two data frames by a column only present in one of the data frames you will raise the error fix.by(by.y, y): ‘by’ must specify a uniquely valid column. You can solve this error by either using a column name present in both data frames...
by Suf | May 2, 2022 | Programming, R, Tips
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...
by Suf | May 2, 2022 | Programming, R, Tips
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...
