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...letters, "") > [,1] [,2] > [1,] "" "B" > [2,] "C" "" > > ifelse(mat_bools, mat_letters, NA) > [,1] [,2] > [1,] NA "B" > [2,] "C" NA > > Marc > > > > Le 03/05/2024 ? 14:47, DynV Montrealer a ?crit : > > Is there a way to get a copy of a matrix only for TRUE entries of a > matching size boolean matrix? For **example**: > > mat_letters <- matrix(data=c('A', 'B', 'C', 'D'), ncol=2, byrow=TRUE) > mat_letters > > [...

Is there a way to get a copy of a matrix only for TRUE entries of a matching size boolean matrix? For *example*: > mat_letters <- matrix(data=c('A', 'B', 'C', 'D'), ncol=2, byrow=TRUE) > mat_letters [,1] [,2] [1,] "A" "B" [2,] "C" "D" > mat_bools <- matrix(data=c(FALSE, TRUE, TRUE, FALSE), ncol=2,

A small number of columns in the data I need to work with are strings, the rest numbers. I'm using read_excel() from the readxl package to get the data ; right after it, the string columns are of type chr and the rest num. I'm tasked with finding out which columns are integers. From an advice, I tried saving the spreadsheet content into a CSV then loading that, which works like a charm ;

I'm tasked to read a table from an excel file and it doesn't mention which method to use. I went back some lessons ago and the 5 years old lesson mentioned to pick a package using the highest score the way of the attached (screenshot). Since there's no requirement of a method to read Excel files, I'd rather use the least error-prone one; what would that be? eg will try multiple