I am wondering about the usage of `cond`

versus `condskeel`

. I am familiar with the condition number, but not as much with the Skeel condition number. I have found that the two functions generally produce numbers of the same order of magnitude given a matrix, although `condskeel`

is significantly faster. However, I am not sure if `condskeel`

is intended to provide a cheaper estimate of the condition number. Moreover, `condskeel`

optionally takes a vector, though I am not sure how the interpretation of `condskeel`

changes when this vector is provided.

If anyone could point me to a resource on the Skeel condition number as defined in Julia, I would be grateful. Googling seems to have turned up little useful information for me.