Take mininum over only two dimensions of 4-d array
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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.
采纳的回答
James Tursa
2013-5-3
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.
更多回答（2 个）
Iman Ansari
2013-5-3
Hi.
R=reshape(1:16,[2 2 2 2]);
M=min(min(R,[],4),[],3);
Andrei Bobrov
2013-5-3
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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