maxmax

find the max value and position from a multi-dimensional matrix

Description

The maxmax function can find the max value and return the positions from a multi-dimensional matrix.
[max_value max_id]=maxmax(x)
The max_value is the biggest value in matrix x, and max_id is structured in [dim1 dim2 dim3...], the length of max_id is equal to the number of the dimensions of matrix x.
This method can be also applied to min and other functions.
e.g.

x=rand(2,8,4);
[max_value max_id]=maxmax(x)

• MATLAB release: MATLAB 5.2 (R10)

[Jos x@y.z]

This submission has no help, contains no comments at all, and is poorly coded.

m = max(x(:)) ;
linind = find(x==m) ;

[Urs (us) Schwarz]

no help -and- even worse, does not work if the input has more than one max value...
eg,

x=ceil(3*rand(2,3,4));
% one of the many solutions...
mv=max(x(:));
mx=find(x(:)==mv);
ix=cell(1,ndims(x));
[ix{:}]=ind2sub(size(x),mx);
ix=[ix{:}];
disp(mv); % max value
disp(ix); % indices

us

[fex observer]

If these two well-known reviewers tell the truth, you should remove this submission.

[Steeve AMBROISE]

Another way, if you want to use the eval function and manipulate strings:

NDim = ndims(X); maxim = 'X'; Indices = ' ';
for i= 1:NDim,
    maxim = strcat('max(',maxim,')');
    Indices = strcat(Indices, 'I', num2str(i),', ');
end
Max = eval(maxim);
Indices = strcat('[', Indices(1:end-1), ']');
eval([Indices, '= ind2sub(size(X), find(X==Max));']);
Ind = eval(Indices);

It works even if several elements have the largest value.

You can use the preceding example.

S.A.

[Jos (10584)]

The solution suggested by S.A. is (almost) as poor as the original submission ...