Remove a column from a matrix in GNU Octave

Question

In GNU Octave, I want to be able to remove specific columns from a matrix. In the interest of generality. I also want to be able to remove specific rows from a matrix.

Answer 1

In case you don't know the exact number of columns or rows you can use the magic "end" index, e.g.:

mymatrix(:,2:end)  % all but first column

mymatrix(2:end,:)  % all but first row

This also allows you to slice rows or columns out of a matrix without having to reassign it to a new variable.