Incrementing rows and columns through looping

Question

Raahul Palanivel Uma 2016-10-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/307093-incrementing-rows-and-columns-through-looping

评论： Adam 2016-10-13

Hello

I'm using a for Loop to determine the closest values for a given Array and store the results in a matrix. The dimensions of the given arrays are A[2001x81] and B[733x1]. The command looks like this

 for p = 1:size(A,2)    
    for q = 2:size(B,1)
        count = count + 1;    
        aa1(:,count) = max(A(A(:,p)<B(q,:)));     
    end     
 end

When I excute the Loop, the values are stored in a single vector [1x59373]. How do I execute the Loop to store the values for each row and column in the same Matrix which should be {733x81] in the end? Thanks in advance.

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Adam 2016-10-13

在 MATLAB Online 中打开

aa1(:,count) = max(A(A(:,p)<B(q,:)))';

probably works though I don't have your data to test it on. I imagine there are also ways to do this without a nested for loop, but I don't have time to consider them at the moment.

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Answer 1

KSSV 2016-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/307093-incrementing-rows-and-columns-through-looping#answer_238779

在 MATLAB Online 中打开

A = rand(2001,81) ;
B = rand(733,1) ;
count = 0 ;
aa1 = zeros(81,733) ;
for p = 1:size(A,2)    
    for q = 2:size(B,1)
        temp = max(A(A(:,p)<B(q)));     
        if ~isempty(temp)
            aa1(p,q) = temp ;
        else
            aa1(p,q) = NaN ;
        end
    end     
 end