Given a matrix mat of size mXn and a row vector v of size 1Xs, return a matrix with m+1 rows that conatains mat over v. The number of columns is the larger between n and s.

If s>n, the matrix is padded with Inf.

If n>s, the vector is padded with -Inf.

Examples:

inputs:
mat = [1  2
       3  4]
v   = [5  6  7  8]

output:
comb = [1   2   Inf  Inf
        3   4   Inf  Inf
        5   6   7    8  ]

inputs:
mat = [1   2   3   4   5
       6   7   8   9   10]
v   = [11  12]

output:
comb = [1    2     3     4     5
        6    7     8     9     10
        11   12   -Inf  -Inf  -Inf]