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Selection by circular indexing

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mahdi Babayi semiromi
评论： mahdi Babayi semiromi 2021-7-1
Hi
I have a vector :
v = (1:10)';
I want to have a function that can select a segment of the vector from index "a" to index "b" such that if "a" is greater than "b", it loops back on the vector and starts from the beginning, i.e., I want the function
function y = circularSelect(v , a, b)
%%
end
such that
circularSelect(v , 7 , 2)
returns
[7, 8 ,9 ,10 , 1 , 2]
I'd like to know if there's a way to do it without using "if" statements, since it's quite trivial how to do it with an "if" statement.
thanks for your answers in advance

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采纳的回答

Yazan
Yazan 2021-7-1
function y = circularSelect(v, a, b)
N = length(v);
idx = a:b+N*(b<a);
idx(idx>N) = idx(idx>N)-N;
y = v(idx);
end

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