Having trouble understanding some code

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Andy 2013-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/72209-having-trouble-understanding-some-code

关闭： MATLAB Answer Bot 2021-8-20

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   %
[col,row]=size(bw);
prj=zeros(col,1);
for i=1:col
    for j=1:row
        if bw(i,j)==0
            prj(i)=prj(i)+1;
        end
        plot(prj(i));
    end
end

The above code is to do a horizontal projection on an image, however, I am not sure how it works and I try to make a plot for the nested loop to get a better understanding but its crashing my computer. Any one kind enough to share some insight into how this works? Help much appreciated, thanks.

-AT