[Chicken-users] Chase's Sequence - syntax fixes, examples, anagram index

[metaperl.j]

1 - Mario fixed the code for Chase's Sequence -
http://galinha.ucpel.tche.br:8080/Chase%20Sequence -
so that it compiles - http://paste.lisp.org/display/50948#1

It had some parenthesis issues. Probably best to update the wiki with the
fixed version.

2 - Could some typical usage examples of this be added?

3 - My goal is to be able to return a unique whole number indicating which
permutation of n items was input. For example, given 3 items, there are 6
permutations. And (iota 6) are the numbers which should be returned for each
of the permutations:

0 1 2  => 0
0 2 1  => 1
1 0 2  => 2
1 2 0  => 3
2 0 1  => 4
2 1 0  => 5

(anagram-index '(1 2 0)) ; => 3

I found some naive scheme code to do this -
http://paste.lisp.org/display/11447, but am not sure if Chase's Sequence
will be useful to do this more efficiently.


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