[gambit-list] Filter

Bradley Lucier lucier at math.purdue.edu
Sun Feb 10 23:55:21 EST 2019

“filter” is not part of the R4RS or R5RS scheme standards, which Gambit implements.  It appears that Marc is rapidly adding routines to Gambit to make it R7RS compliant, but I don’t see a “filter” routine in R7RS-small.

“Filter” is implemented in SRFI-1, and there is port of SRFI-1 to Gambit in the “Dumping Grounds”:


Perhaps this would be of help.


> On Feb 10, 2019, at 12:46 PM, Steve Graham <jsgrahamus at yahoo.com> wrote:
> Tried a code snippet with Gambit 4.7.4 on my iPhone and got an unbound variable error for filter.  I noticed the same thing on my laptop’s version (4.8.9).  Dybvig’s 4th edition of The Scheme Programming Language lists filter as part of the language on page 164.
> Why does it not exist in Gambit Scheme?
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