Inserting a column vector as a column in a new matrix.

2012 10 17
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Hello,
I have a column vector (say X). And I want to make that vector as a column in my new matrix, i.e., the first column is only 1s, second column is X and third column is X^2.
Any idea as how to do it?
Thanks !!!

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更多回答（3 个）

Matt J
Matt J 2012-10-17

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I suspect that this is what you really want:
vander(X).'
or
bsxfun(@power,X(:),[0,1,2]);
Swasti Khuntia
Swasti Khuntia 2012-10-17

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Thanks a lot Sachin and Matt !! Both of them works out for me. Since Sachin answered it first, I had to accept it :)
Matt J
Matt J 2012-10-17

0 个投票

I'm also going to hazard a guess that the matrix you're trying to create is meant so that you can fit a quadratic polynomial.
If so, you should probably be using POLYFIT instead, which is more stable.

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