Finding the indices of the maximum of a matrix for plotting

Hello, I'm trying to find the indicies of the maximum value of this matrix.

When I use the auto-index finder that's built into the 'max' function, it doesn't correspond to the maximum value of the matrix when plotted.

How do I find the indicies that correspond to the maximum value of m (when plotted)?

Any help is much appreciated.

clear;clc

load('x.mat')
load('y.mat')
load('m.mat')

figure
imagesc(x,y,m)
hold on
set(gca,'YDir','normal')
[maxval,maxidxX] = max(max(m,[],1));
[~,maxidxY] = max(max(m,[],2));
plot(x(maxidxX),y(maxidxY),'w*')

Answer 1

[KSSV]

load('x.mat')
load('y.mat')
load('m.mat')
[X,Y] = meshgrid(x,y) ; 

Z = m ; 
% Make Z equal to size of X, Y
Z(1,:) = []; 
Z(:,1) = [] ;
% get max value 
[val,idx] = max(Z(:)) ; 
% plot
pcolor(x,y,Z)
shading interp 
colorbar
hold on
plot(X(idx),Y(idx),'*r')