Trouble with saving outer loop values

Question

klb 2021-3-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/762201-trouble-with-saving-outer-loop-values

评论： klb 2021-3-4

采纳的回答： David Hill

在 MATLAB Online 中打开

Hi eveyone,

Tying to save outer loop iteration. Code works as wanted till first comment

clear all
A = [12 4; 
     1, 25; 
     4,19]
B = [90, 85; 
     60, 50; 
     90,40]
maxval=[];
for w = 1:5
    
    for r = 1: size(A,1)
        
        run1 = 2*A(r,1)+ r*B(r,1);
        run2 = 3*A(r,2)+  B(r,2);
        
        mat(r,:) = [run1, run2 ];
    end
    
     mat
    [what , where] = max(sum((mat),2))
     maxval = [w,mat(where,:)]
end
% here on is the bad code bit. tying to save/pass on the 'maxval' for each outer loop iteration. 
% tried this: 
maxval= [maxval;maxval] 

And got:

5 278 97

% also tried 
maxval (w,:) = maxval

and got :

[ 5 278 97

0 0 0

5 278 97]

Niether are correct.

Expected output is not those but this:

[ 1 278 97

2 278 97

3 278 97

4 278 97]

5 278 97]

What am I not doing right ?

Thank for your time!

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Answer 1

David Hill 2021-3-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/762201-trouble-with-saving-outer-loop-values#answer_638556

在 MATLAB Online 中打开

A = [12 4; 
     1, 25; 
     4,19];
B = [90, 85; 
     60, 50; 
     90,40];
maxval=[];
for w = 1:5
    
    for r = 1: size(A,1)
        
        run1 = 2*A(r,1)+ r*B(r,1);
        run2 = 3*A(r,2)+  B(r,2);
        
        mat(r,:) = [run1, run2 ];
    end
    [what , where] = max(sum((mat),2));
     maxval(w,:) = [w,mat(where,:)];
end