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Derangements and System` Prefix

Bruce Colletti
Posted 10 years ago
POSTED BY: Bruce Colletti
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Bruce Colletti
Bruce Colletti
Posted 10 years ago

Thanks Dan.

This is eerie: although I had been concerned about creating all derangements, I ended the workday wondering about the value of random derangements -- the very matter that your link addressed! I had forgotten all about MathGroup.

In addition to being scary smart, the Wolfram Team apparently has ESP. That always helps in securing the marketplace and in product development.
POSTED BY: Bruce Colletti

It isn't difficult to define one's own Derangements function in a line or two of WL code. See this thread on StackOverflow for some very efficient implementations.
POSTED BY: Ilian Gachevski
Bruce Colletti
Bruce Colletti
Posted 10 years ago

Thanks, Ilian. I'll use one of these if there's indeed no built-in functionality (in the kernel) like Combinatorica's Derangements function (which I'm now using but want to avoid because of the conflicts with the kernel).
POSTED BY: Bruce Colletti

Also maybe some methods in this thread.
POSTED BY: Daniel Lichtblau
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