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Take mininum over only two dimensions of 4-d array

Asked by Eva on 3 May 2013

I have a 4-D array array=[i,j,k,l]. For given values of i and j, I would like to know the minimum value in the array for any k or l, as well as the values of k and l for this value.

Basically I'd like something like [min_value, min_k, min_l]=min (array,[],3:4)

but min, as far as I can tell, doesn't take minima over multiple dimensions.

Thanks in advance.

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Eva

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3 Answers

Answer by James Tursa on 3 May 2013
Accepted answer
sub_array = array(i,j,:,:);
[V X] = min(sub_array(:));
[I J K L] = ind2sub(size(sub_array),X);

The minimum value in the specified sub array will be V, and the indexes for the 3rd and 4th dimensions will be K and L.

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James Tursa
Answer by Iman Ansari on 3 May 2013

Hi.

R=reshape(1:16,[2 2 2 2]);
M=min(min(R,[],4),[],3);

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Iman Ansari
Answer by Andrei Bobrov on 3 May 2013
a = randi(10,4,5,2,3); % eg
s = size(a);
a1 = reshape(a,s(1),s(2),[]);
[m1,i1] = min(a1,[],3);
k = mod(i1-1,s(3))+1;
l = ceil(i1/s(3));

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Andrei Bobrov

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