Hi! I would like to ask if there are routines for the following issues:
1) Extract a row/column of a matrix.
2) If theta is a vector extract a subvector. For example extract the elements 4 until 8 of theta.
3) Merge 2 vectors. For example if a, b be row vectors I want to create a new vector c with the first row be the a vector and the second row will be the b vector.
I know that the above can be done using "for", but I' m interested in using routines (if there are).
Thank you in advance.