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Re: Numerical Comparison: "required coercions"
- To: email@example.com, Common-Lisp@sail.stanford.edu, DCP@quabbin.scrc.symbolics.com, Greenwald@stony-brook.scrc.symbolics.com, Moon@stony-brook.scrc.symbolics.com, firstname.lastname@example.org
- Subject: Re: Numerical Comparison: "required coercions"
- From: Guy Steele <gls@Think.COM>
- Date: Thu, 26 Mar 87 15:08 EST
- Cc: Numerics@stony-brook.scrc.symbolics.com, email@example.com
- In-reply-to: <8703261954.AA05911@mike>
Date: Thu, 26 Mar 87 11:54:28 PST
From: firstname.lastname@example.org (Richard Fateman)
I think that comparing more than 2 operands could simply be
forbidden since the semantics is unclear and the utility
The convenience is considerable when working with integers in
such expressions as
(<= 0 J N)
(< -1 J K (+ N 1))
Admittedly this does not allow similarly concise expression of such common
mathematical idioms as 0 <= j < n where the comparisons differ as to
whether equality is to be included.
I agree that using more than two arguments with floating-point
numbers should perhaps be avoided as a matter of style.