Sort matrix by rows

I have a matrix in 3x20 cell array.

I now have to first sort my matrix by row 2 in ascending order and after that sort by row 2 and 3.

I've tried

D = sortrows(QRT,3)

but get the error message:

Error using char
Cell elements must be character arrays.

Error in sortrows>sort_cell_back_to_front (line 136)
            tmp = char(x(ndx,k));

Error in sortrows (line 88)
        ndx = sort_cell_back_to_front(x_sub, col);

My first row is characters and the rest is numbers.

[Azzi Abdelmalek]

post a sample of your data

[Kasper]

I figured it out. Just had to write it like this:

D = sortrows(QRT',3)

I had mixed up columns and rows xD - My data was in 3 columns, instead of 3 rows. So that's why I couldn't sort it. The little ' did the work.