- `C = cond (A)`
- `C = cond (A, P)`

Compute the condition number of matrix `A`.

The optional `P` argument selects the norm used for the computation. The
condition number measures the sensitivity of a linear system to perturbations.

See also: `rank`, `norm`, `svd`.

### References

- https://www.mathworks.com/help/matlab/ref/cond.html
- https://octave.sourceforge.io/octave/function/cond.html