Perform Operation Only on Specified Rows.

Question

Ellie 2015-7-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/231821-perform-operation-only-on-specified-rows

编辑： dpb 2015-7-31

I have attempted to modify this code that circshifts the even rows a specified number of times, however I would like to make it more general, specifically to shift the first row by 0, the second row by N, the third row by N^2 the, then repeat after N times. Any help would be appreciated. Thanks.

A=randi(9,10,4)
N = 3;
for i = 1:N
  idx=i:N:size(A,1) 
  Ae=A(idx,:);
     for jj = i:N^2
         Ae1=circshift(Ae,[0 -jj]); 
         A(i,:)=Ae1; 
     end
end

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Answer 1

dpb 2015-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/231821-perform-operation-only-on-specified-rows#answer_187833

编辑：dpb 2015-7-31

在 MATLAB Online 中打开

Warning: air code; untested...

k=0;  % row counter (or compute on fly from i,j, your choice...)
L=size(A,1);
for i = 1:N:L % over number of sets of N in A 
   for j = i:N
     k=k+1;
     if k>L,break,end  % done...
     A(k,:)=circshift(A(k,:),[0 -j.^N]); 
   end
end