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FUNCTION shift of vector's position

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amjad hammad
amjad hammad 2021-12-6
评论： Chunru 2021-12-9
ANYONE CAN HELP ME PLS TO CREAT THIS FUNCTION I TRIED TO DO IT BUT I COULDNT WITHOUT any toolbox functions of cycles
function rotated = rotateRight( vector, shift )
% Performs cyclic shift of vector's position - the ROR operation.
% Performs horizontal ROR, if a matrix is supplied, rotate all rows.
% The scalar shift specifies how many positions to rotate
% if negative, a ROL operation is performed.
% You cannot use any toolbox functions of cycles,
% just indexing.

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amjad hammad
amjad hammad 2021-12-8
编辑：Walter Roberson 2021-12-8
rotated = zeros(1, size(vector, 2))
shift = mod(shift, size(vector, 2))
rotated(1:shift) = vector(end-shift+1:end)
rotated(shift+1:end) = vector(1:end-shift)
i did it in this way but is there anyone have another method how to do it with same conditionals
  2 个评论
Walter Roberson
Walter Roberson 2021-12-8
This will work in one direction but not the other:
rotation([shift+1:end, 1:shift]) = vector

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更多回答（2 个）

Chunru
Chunru 2021-12-7
编辑：Chunru 2021-12-7
Here is some pseudo code:
%1. Let the vector index be idx = (0:n-1) + 1
%2. When rotating to right by "shift" (which can be +ve/-ve), the corresponding index becomes
% newIdx = mod((0:n-1) + shift, n) + 1;
% where mod implements the rotation.
%3. Get the rotated vector: y = vector(newIdx)
  2 个评论
amjad hammad
amjad hammad 2021-12-8
thanks but i tried what you mean but i get this answer
y =
3 4 5 6 7 8 9 10 1 2
what i need be like this the and will be like arraythis vector 1:10 and shift 2
rotated =
9 10 1 2 3 4 5 6 7 8

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Walter Roberson
Walter Roberson 2021-12-7
Take a copy of what is about to be overwriten.
Use array subscripts to move the old data to the new positions. For example
A(:,1:5) = A(:,3:7);
Now write the saved data to the other end of the array, into the spots vacated, like A(:,6:7)

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