Sorting and undefined values

Earle Martin perl at
Wed Dec 13 11:27:15 GMT 2006

Hi Andy.

On 12/12/06, Andy Armstrong <andy at> wrote:
> What has to happen in the case where x is defined for one side of the
> comparison but not the other? Do you want to compare x only if x is
> defined for both sides? And by defined do you actually mean exists?

Good questions all. This morning, after having slept on it, I wrote
some logic to produce a combination field based on x & y - call it mu
- first, which I can now simply sort on. My problem here was trying to
do too much in the sort.

Thanks for your help!

Earle Martin

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