For loop inside for loop

Hi, I have the following function that I am using with a single rho(1x654545) -attached. The result gives me the single peaks(1x1023). I would like to modify the script so that I can use as input rho(4x654545) and end up with the result peaks(4x1023).

Can I get some help? Thanks

x = diff(sign(rho)); 
indx = find(x>0); 
for jj=2:length(indx);
   tmp = rho(indx(jj-1):(indx(jj))); 
   test = dt*(indx(jj)-indx(jj-1));
   peaks(jj) = max(tmp);
end

[KL]

Yes, read this .

[Adam]

There doesn't seem to be any guarantee that you will have 1023 values > 0 for each of your 4 rho arrays.

[Isma_gp]

Yes, that is true. The number of values >0 could vary.

[Adam]

In that case you'd have to use a cell array or a 2d numeric array with enough rows for the case with most peaks and leave NaNs in the extra rows for the other columns.