# repeating a vector with increments

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Jeong Ho 2015년 2월 20일
답변: arich82 2015년 2월 20일
Dear Matlab Central users, Hi, I have a row vector I and I want to create a row vector [I I+n I+2*n ... I+(N-1)*n] where N>1 and n are positive integers. For example, if I = [2 3] and N = n = 3, [2 3 5 6 6 9] Is there a trick to doing this efficiently? Thank you all!
Best, John

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### 답변 (2개)

Star Strider 2015년 2월 20일
The output vector you listed does not seem to me to correspond to the rule for it you posted. Please clarify.
This otherwise seems to work:
N = 3;
I = [2 3];
Q = (cumsum(ones(N,2))-1)*N;
Ym = bsxfun(@plus, I, Q);
Yv = reshape(Ym', 1, []); % Output
produces:
Yv =
2 3 5 6 8 9
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arich82 2015년 2월 20일
Assuming you have a typo in your example and your desired output is actually
[2, 3, 5, 8, 9]
(i.e. an 8 instead of the repeated 6), then I think this should do what you want:
n = 3;
N = 3;
a = [2, 3];
b = n*[0:N-1];
c = bsxfun(@plus, a.', b);
c = c(:).'
or as a messy one-liner:
reshape(bsxfun(@plus, [2, 3].', 3*(0:3-1)), 1, []);
No gurantees that someone won't have a more clever solution, but if this doesn't give the desired result, perhaps a little more clarification would be helpful.

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