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

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 !!!

Answer 1

[Sachin Ganjare]

new_matrix = [1s_col X X^2]

Answer 2

[Matt J]

I suspect that this is what you really want:

 vander(X).'

or

bsxfun(@power,X(:),[0,1,2]);

Answer 3

[Swasti Khuntia]

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

Answer 4

[Matt J]

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.