If you’re just finding the max in one column (column 8 in your code), you can just use the max function with two outputs:
[maxh,row] = max(data(:,8));
then if you only want to plot from 1 to ‘row’ (the index of your maximum height value), specify those indices in your plot call:
ixrng = 1:row;
plot(sondedata(ixrng,10),sondedata(ixrng,9),'b-',sondedata(ixrng,4),sondedata(ixrng,9),'r-')
I don’t have your data and I don’t know how ‘data’ relates to ‘sonedata’ so I’m just guessing here.
