how to create matrix X

I am trying to create a matrix X like in the attached image. I have the vectors x,y,z denoted as DE,DN,DZ respectively.

Answer 1

[Star Strider]

That is straightforward, using the (:) addressing to create column vectors regardless of their original orientation:

X = [ones(size(DE(:))) DE(:) DN(:) DZ(:)];

If you also have your ‘g’ vector (all vectors must be the same length), calculate the ‘a’ coefficients as:

a = X\g(:);