Find closest value to a constant in a multidimensional array column wise

Question

toka55 2018-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/407849-find-closest-value-to-a-constant-in-a-multidimensional-array-column-wise

评论： toka55 2018-6-28

I have a matrix B B(:,:,1) =

         2     8
         0     5

B(:,:,2) =

         1     3
         7     9   
I want to find the index of a value close e.g. to 2.9. in each column. I tried the following code:  
[r,c,v] = ind2sub(size(B),find(min(abs(B-2.9))));  
I get:

r =

What I want is:

r = 1,2,1,1 c = 1,2,1,2 v = 1,1,2,2

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Answer 1

Rik 2018-6-28

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The method I used below is to separate the parts the array you want to test from the rest of the array. As you can see in the disp, the result is indeed r=[1,2,1,1] c=[1,2,1,2] v=[1,1,2,2].

B=cat(3,[2,8;0,5],[1,3;7,9]);
b=2.9;
[v,c]=meshgrid(1:size(B,3),1:size(B,2));
temp=mat2cell(B,size(B,1),ones(1,size(B,2)),ones(1,size(B,3)));
[~,row_index]=cellfun(@(x) min(abs(x-b)),temp,'uni',0);
r=cell2mat(row_index(:))';
c=c(:)';
v=v(:)';
disp([r;c;v])