MATLAB: How to get dynamic variable background colors

backgroundMATLABpatchpatchesplot

Hi, I have two vectors vec1 and vec2 of the same length that I am plotting in one graph. I want a background color to show up where vec1 has a greater value than vec2. I tried doing this with patches but I can't get the indices right.
      h=patch([xcolstart xcolend xcolend xcolstart],[0 0 5 5],'g');
      set(h,'FaceAlpha',0.2);
      set(h,'EdgeColor','none');
Basically I need the indices of start and end points xcolstart and xcolend in sections where vec1>vec2. Is there an elegant way of doing this or is there another function besides patch that can do this more easily? Thank you

Best Answer

I think I figured it out myself:
    bool=1;
    for ii=1:numel(vec1)
        if(abs(vec1(ii))>abs(vec2(ii)))
            if bool==1
                xcolstart=ii;
                bool=0;
            end
        else
            if bool == 0
                xcolend=ii;
                h=patch([xcolstart xcolend xcolend xcolstart],[-100 -100 100 100],'g');
                set(h,'FaceAlpha',0.2);
                set(h,'EdgeColor','none');
                bool=1;
            end
        end
    end
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