MATLAB: Meaning of ~isempty()

Question

Hello, i would like to know what this expression means : ~isempty(t) where t is a vector ?

At the beginning i thought it was just to know if t is a empty vector but if remove the ~ my code doesn't work anymore. So what do you think of that ?

Thanks a lot !

Answer 1

~ means NOT

so isempty tells you if the vector is empty and ~isempty tells you if the vector is not empty.