How can I plot the maximum values of the double matrix ?

I have a double matrix (200 x 200 double). When I plot it it looks like this.

I want to get the maximum values of this plot like shown in the example.

I have tried to loop inside the elements with the length of the matrix and use findpeaks and assign the maximums to the indexes.

for i = 1:length(E2_gc_comparisn)
    [pks,locs,fwhm,proms] = findpeaks(E2_gc_comparison(:,i),XX);
 [~,j] = max(pks);
 angle(i) = locs(j);
end
%Where E2_gc_comparison is my matrix
%Another way to do it to use 
[M,I] = max(E2_gc_comparison)
    

But when I try to plot it I get:

%Another way that I tried 
Val = unique(E2_gc_comparison)

And also got the same graph. How can I plot the matrix so I have something like this.

Answer 1

[Joel Lynch]

Max() has an optional third argument that determines the index along which to take the maximum. So for a 10x20 matrix A,

A_max(1,1:20) = max( A, [], 1 ) % Take maximum of all rows, at each column of A

and

 A_max(1:10,1) = max( A, [], 2 )  % Take maximum of all columns, at each row of A

So for your problem, you should try this:

[M,I] = max(E2_gc_comparison,[],idx) % where idx = 1 or 2, depending on size of E2_gc_comp

[Vahram Voskerchyan]

Thank you for your reply I have tried that my matrix size is 200 200, I used index of 1 and still got the same result. Using indx = 2 gives even worse result.

[Joel Lynch]

Can you attach your m-file and relevant source data?

[Vahram Voskerchyan]

yes here it is. This is the data that I want to plot.

[Joel Lynch]

When I load the MAT file and run

plot(max(E2_gc_comparisn,[],2))

I get the following plot:

Is this not correct?

[Vahram Voskerchyan]

Oh yeah it is! Thanks a lot, I was doing something wrong.