R - argument is of length zero in if statement

Question

I am having a little problem with R and I am not sure why. It is telling me that this line: if(temp > data[[k]][[k2]]) { is of argument length 0. Here is the

Answer 1

You can use isTRUE for such cases. isTRUE is the same as { is.logical(x) && length(x) == 1 && !is.na(x) && x }

If you use shiny there you could use isTruthy which covers the following cases:

• FALSE

• NULL

• ""

• An empty atomic vector

• An atomic vector that contains only missing values

• A logical vector that contains all FALSE or missing values

• An object of class "try-error"

• A value that represents an unclicked actionButton()