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# Perform Operation Only on Specified Rows.

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Ellie on 30 Jul 2015
Edited: dpb on 31 Jul 2015
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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### Answers (1)

dpb on 31 Jul 2015
Edited: dpb on 31 Jul 2015
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
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