Create a row vector with specific condition

Question

Chet Sharma 2018-3-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/390309-create-a-row-vector-with-specific-condition

评论： Chet Sharma 2018-3-23

采纳的回答： James Tursa

在 MATLAB Online 中打开

Hi I'd like to make a row vector as follows:

rowVect = [x y y y y y]

Right now, I'm doing:

rowVec = x
rowVec(2:5)=y

Is there a way to do this in one line of code?

Thanks C

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Answer 1

James Tursa 2018-3-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/390309-create-a-row-vector-with-specific-condition#answer_311617

编辑：James Tursa 2018-3-23

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What's wrong with the first method you propose?

rowVect = [x y y y y y];

If you want to generalize it (maybe you don't know the number of y's you need ahead of time)

n = number of y's you want
rowVect = [x,repmat(y,1,n)];

That being said, your two-liner above is a pretty good way of doing it. Is there some particular reason you don't like it?

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Chet Sharma 2018-3-23

Thanks!! I tried everything except look at repmat..my bad! To answer your question, nothing wrong with what I wrote, but exactly as you said right...the number of y's I have changes, so I need to generalize. So your solution is exactly what I needed. Thanks James

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