Only Shifting the outer loop

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Gina Barlage
Gina Barlage 2015-5-31
评论： Gina Barlage 2015-6-2
This is the assignment I was given: he script should assume an m-by-n array A (m, n >= 2) is assigned in the Command Window. The value mover should also be assigned. The script should rotate all of the values on the outer loop of the array by mover spots clockwise and call the output A_out.
Example executions follow:
>> A = [1 2 3 4 5; 6 7 8 9 10; 11 12 13 14 15; 16 17 18 19 20]; mover = 2;
>> script25
A_out =
11 6 1 2 3
16 7 8 9 4
17 12 13 14 5
18 19 20 15 10
So far I have where it shifts by two positions but I don't know how to get the jut the outer loop to shift. Any hints?
A = [1 2 3 4 5; 6 7 8 9 10; 11 12 13 14 15; 16 17 18 19 20]
mover = 2
B = circshift(A,mover,2)
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Walter Roberson
Walter Roberson 2015-6-2
Don't shift the indices, shift the content. See where I said "insert the circshift'ed Values"? Values, not indices
Gina Barlage
Gina Barlage 2015-6-2
Ok I get it now thanks so much!

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回答（1 个）

Matt J
Matt J 2015-5-31
编辑：Matt J 2015-5-31
As a hint, the following should give you the Linear Indices of the outer edges of the matrix in clockwise order,
I=reshape(1:m*n,m,n);
outerIndices=[I(1,:),I(2:end-1,end).',I(end,end:-1:1),I(end-1:-1:2,1).'];
  2 个评论
Gina Barlage
Gina Barlage 2015-5-31
Thanks so much! I understand how this works but how do I incorporate the outerindices and the inside of array A?
Jan
Jan 2015-6-1
Values = A(outerIndices)
A(outerIndices) = ...

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