I'm trying to write some code to calculate a cumulative distribution function in matlab. When I try to actually put my results into an array it yells at me.

tempnum = ordered1(1);
k=2;
while(k<538)
    count = 1;
    while(ordered1(k)==tempnum)
        count = count + 1;
        k = k + 1;
    end
    if(ordered1(k)~=tempnum)
        output = [output;[(count/537),tempnum]];
        k = k + 1;
        tempnum = ordered1(k);
    end
end

The errors I'm getting look like this

??? Error using ==> vertcat
CAT arguments dimensions are not consistent.

Error in ==> lab8 at 1164
        output = [output;[(count/537),tempnum]];

The line to add to the output matrice was given to me by my TA. He didn't teach us much syntax throughout the year so I'm not really sure what I'm doing wrong. Any help is greatly appreciated.