how to correct this for loop code?

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Dhines
Dhines 2013-1-18
for i=1:1:51
for j=1:1:51
if(i+1)>51
k=1;
else
k=i+1;
end
a1h(i,j)=A1(i,j)-A1(k,j);
end
end
%calculate vertical array
% a=input('enter the matrix');
for j=1:1:56
for i=1:1:56
if(j+1)>56
k=1;
else
k=j+1;
end
a1v(i,j)=A1(i,j)-A1(i,k);
end
end
when i run this code getting this error...
??? Attempted to access A1(52,1); index out of bounds because size(A1)=[51,56].
Error in ==> matrixupdate at 182
a1v(i,j)=A1(i,j)-A1(i,k);

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回答（1 个）

Walter Roberson
Walter Roberson 2013-1-18
In your first loop, you limit "i" and "j" to 51, but in the second loop you limit them to 56. If you want to work on a 51 x 56 array, limit i to 51 and limit j to 56.

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