How to merge 3 matrices into 1 in opencv?

Question

I have three matrices, each of size 4x1. I want to copy all of these matrices to another matrix of size 4x3 and call it R. Is there a

Answer 1

For those using OpenCv in Python, if you have arrays A, B, and C, and want array D that is horizontal concatenation of the others:

D = cv2.hconcat((A, B, C))

There is also a vconcat method.