condskeel
condskeel(M, [x, p])
$$\kappa_S(M, p) & = \left\Vert \left\vert M \right\vert \left\vert M^{-1} \right\vert \right\Vert_p \ \kappa_S(M, x, p) & = \left\Vert \left\vert M \right\vert \left\vert M^{-1} \right\vert \left\vert x \right\vert \right\Vert_p$$
Skeel condition number $\kappa_S$ of the matrix M, optionally with respect to
the vector x, as computed using the operator p-norm. p is Inf by
default, if not provided. Valid values for p are 1, 2, or Inf.
This quantity is also known in the literature as the Bauer condition number, relative condition number, or componentwise relative condition number.
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