How does one subtract two msheatmaps to produce a result that highlights differences between the two heatmaps

Is there a way to subtract two heatmaps to produce a third that shows only the differences between the two ?. The problem lies in the fact that mzXML2peaks function stores the ion intensities as a cell array and its impossible to subtract two different cell arrays in MATLAB. Even after resampling, the problem still persists. Tvec is just a brute force alignment solution that excludes the need for msalign functions. How do I subtract the two heat maps ?

sample1= mzxmlread('Sample1.mzXML') [ps,ts] = mzxml2peaks(sample1,'level',1); [MZs,Ys] = msppresample(ps,5000);

sample2= mzxmlread('Sample2.mzXML') [pg,tg] = mzxml2peaks(sample2,'level',1); [MZg,Yg] = msppresample(pg,5000);

plot( msheatmap(MZs,tvec,log(Ys2),'resolution',0.15)- msheatmap(MZg,tvec,log(Yg2),'resolution',0.15))