Question

I have assignment using R and have a little problem. In the assignment several matrices have to be generated with random number of rows and later used for various calculations. Everything works perfect, unless number of rows is 1.

In the calculations I use nrow(matrix) in different ways, for example if (i <= nrow(matrix) ) {action} and also statements like matrix[,4] and so on.

So in case number of rows is 1 (I know it is actually vector) R give errors, definitely because nrow(1-dimensional matrix)=NULL. Is there simple way to deal with this? Otherwise probably whole code have to be rewritten, but I’m very short in time 🙁

Answer 1

Let’s call your vector x. Try using matrix(x) or t(matrix(x)) to convert it into a proper (2D) matrix.