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A comment on Learn Prolog Now. Parent comment

Re:Learn Prolog Now by Animats on Sunday March 22, 2015 @01:48PM (#9247613)
Prolog isn't a numerical constraint solver.

I once had to write a menu system in Turbo Prolog. Not fun. Totally the wrong tool for the job. Prolog isn't that useful when you have to cause an action, as opposed to computing a result.

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Re:Learn Prolog Now by abathologist on Sunday March 22, 2015 @03:16PM (#9247875)
Have you used any of the numerical constraint solving libraries available for many Prolog implementations?[1] (It is also worth noting that Turbo Prolog is a rather peculiar—and now rather old—take on Prolog. I believe it has been superseded by Visual Prolog).

[1]: e.g., SWI Prolog's http://www.swi-prolog.org/pldoc/man?section=clpfd, or http://www.swi-prolog.org/pldoc/man?section=clpqr

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