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How could you find the index number of an answer output?

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Chelsey
Chelsey 2011-7-18
I have a code that looks like:
for ii=2:length(dep);
dz(ii) = dep(ii)-dep(ii-1);
drho(ii) = sigth(ii)-sigth(ii-1);
end
for ii=1:length(dz);
drhodz(ii) = drho(ii)/dz(ii);
end
max(drhodz)
Is there a way to go back and then see which ii this maximum answer corresponds to? (Does that question make sense? After finding the maximum drhodz I'm trying to work backwards to see at which dz (change in depth) this max occurs.)

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Arnaud Miege
Arnaud Miege 2011-7-18
[max_value, max_idx] = max(drhodz)
The index ii corresponding to the maximum value max_value is given by max_idx.
HTH,
Arnaud

更多回答（2 个）

Sean de Wolski
Sean de Wolski 2011-7-18
Arnaud's reply is correct
To find the indices of multiple maxima:
find(drhodz==max(drhodz));
Also, your for-loops can be easily vectorized with:
dz = diff(dep);
drho = diff(sigth);
drhodz = dz./drho;
Chelsey
Chelsey 2011-7-18
Thank you both!

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