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- To: hplabs!common-lisp@su-ai.ARPA
- Subject: truncate/round/floor/ceiling functions
- From: firstname.lastname@example.org
- Date: Mon, 25 Feb 85 13:25:26 pst
- Mmdf-warning: Parse error in preceding line at CSNET-RELAY.ARPA
- Source-info: From (or Sender) name not authenticated.
I think that I may have found an inconsistent definition for the
functions floor/round/ceiling and trucate.
This inconsistency occurs when there are 2 arguments. For example, let
us look at `(truncate 10.0 4.0)'.
1). We see that (truncate 10.0 4.0) is defined to be equivalent to
(truncate (/ 10.0 4.0)) = (truncate 2.5), which yields (2 0.5).
2.) However, applying the sentence (from pg 216 in the Aluminum Edition)
"If any of these functions is given 2 arguments x and y and
produces results q and r, then q*y + r = x."
yields, for x=10.0 and y= 4.0, q=2 and r=2.0, or a result of
We then have 2 different results for `truncate 10.0 4.0', depending upon
whether one does the division or not.
How is this resolved? Any clarifications would be appreciated.
Ft. Collins, Colorado