# Circular shifting or rotating structure of array elements

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NALLARASU KRISH am 4 Mär. 2024
Kommentiert: Voss am 5 Mär. 2024
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?
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Dyuman Joshi am 4 Mär. 2024
You should experiment with it, and see what results you get.

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### Akzeptierte Antwort

Voss am 4 Mär. 2024
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
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NALLARASU KRISH am 5 Mär. 2024
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!
Voss am 5 Mär. 2024
You're welcome!

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### Weitere Antworten (3)

Hassaan am 4 Mär. 2024
Bearbeitet: Hassaan am 4 Mär. 2024
% Shift rows up by one position, making the third row the first
A_shifted = circshift(A, -1);
Reference
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NALLARASU KRISH am 4 Mär. 2024
Thank you! Your approach works on arrays and matrices, but not on structure of arrays!

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Sam Chak am 4 Mär. 2024
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
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NALLARASU KRISH am 5 Mär. 2024
Now i understood. Thank you!

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Voss am 4 Mär. 2024
Bearbeitet: Voss am 4 Mär. 2024
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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