Matrix row norm: rownorm rowNorm

### 6.50.4 Matrix row norm: rownorm rowNorm

The row norm of a matrix A is maxk(∑j |aj,k|). (This is also an operator norm; see Section 6.50.6.) The rownorm command finds the row norm of a matrix.
rowNorm is a synonym for rownorm, and for matrices linfnorm is also a synonym.

- rownorm takes one argument:
  A, a matrix
- rownorm(A) returns the row norm of A.

Example.
Input:

rownorm([[1,2],[3,-4]])

Output:

7

Indeed: max(1+2,3+4)=7.