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Circular shifting or rotating structure of array elements

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NALLARASU KRISH
NALLARASU KRISH 2024-3-4
评论： Voss 2024-3-5
I have a structure of array of size 1x3 containing x and y coordinates as follows.
4 8
20 24
5 15
I want to shift the third row to first one. later 2nd one to first row. How to do it by using circshift?
  1 个评论
Dyuman Joshi
Dyuman Joshi 2024-3-4
You should experiment with it, and see what results you get.
Refer to the documentation for more information and examples.

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采纳的回答

Voss
Voss 2024-3-4
Ran in:
A 1x3 array of structures:
S = struct('x',{4 20 5},'y',{8 24 15})
S = 1×3 struct array with fields:
x y
S.x
ans = 4
ans = 20
ans = 5
S.y
ans = 8
ans = 24
ans = 15
1. Shift the third element to first one using circshift:
S = circshift(S,1);
S.x
ans = 5
ans = 4
ans = 20
S.y
ans = 15
ans = 8
ans = 24
2. Later 2nd one to first element using circshift:
S = circshift(S,-1);
S.x
ans = 4
ans = 20
ans = 5
S.y
ans = 8
ans = 24
ans = 15
  2 个评论
NALLARASU KRISH
NALLARASU KRISH 2024-3-5
I apreciate your approach in explaining array of structures and structure of arrays. Positive sign means shifting downwards and vice versa. Numerical value denotes the number of times the shift to occur. Thank you!

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更多回答（3 个）

Hassaan
Hassaan 2024-3-4
编辑：Hassaan 2024-3-4
% Shift rows up by one position, making the third row the first
A_shifted = circshift(A, -1);
where A is your matrix/array.
Reference
Shift array circularly - MATLAB circshift (mathworks.com)
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Sam Chak
Sam Chak 2024-3-4
Ran in:
Hi @NALLARASU KRISH
Me, first time using circshift(). So, I'm not entirely sure about your intention. Are you suggesting to swap the 3rd row with the 1st row? And then, do you want to swap the 2nd row with the newly positioned 1st row?
Please clarify if my understanding is correct.
A = [ 4 8 % 1st row
20 24 % 2nd row
5 15]; % 3rd row
A([1,3],:) = circshift(A([1,3],:), 1)
A = 3×2
5 15 20 24 4 8
A([1,2],:) = circshift(A([1,2],:), 1)
A = 3×2
20 24 5 15 4 8
Voss
Voss 2024-3-4
编辑：Voss 2024-3-4
Ran in:
A structure of arrays:
S = struct('x',[4;20;5],'y',[8;24;15])
S = struct with fields:
x: [3×1 double] y: [3×1 double]
S.x,S.y
ans = 3×1
4 20 5
ans = 3×1
8 24 15
1. Shift the third row to first one using circshift:
S = structfun(@(v)circshift(v,1),S,'uni',0);
S.x,S.y
ans = 3×1
5 4 20
ans = 3×1
15 8 24
2. Later 2nd one to first row using circshift:
S = structfun(@(v)circshift(v,-1),S,'uni',0);
S.x,S.y
ans = 3×1
4 20 5
ans = 3×1
8 24 15

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