[Maxima-bugs] [ maxima-Bugs-1304714 ] sign(infinity) & sign(infinity^2)

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Bugs item #1304714, was opened at 2005-09-26 04:53
Message generated for change (Comment added) made by robert_dodier
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>Category: Lisp Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Barton Willis (willisbl)
Assigned to: Nobody/Anonymous (nobody)
Summary: sign(infinity) & sign(infinity^2)

Initial Comment:
For consistency with sign(%i) --> error, I think
sign(infinity) should also signal an error. But it
doesn't:

(%i1) sign(infinity);
(%o1) PNZ

No debate about these --- PZ is a bogus
evaluation for sign(infinity^2):

(%i2) sign(infinity^2);
(%o2) PZ
(%i4) ?csign(infinity^2);
(%o4) PZ

Barton

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>Comment By: Robert Dodier (robert_dodier)
Date: 2005-10-08 15:34

Message:
Logged In: YES 
user_id=501686

I would be happier with sign(infinity) => und (likewise
sign(%i) => und). Calling merror pretty much precludes
further progress; returning something or throwing something
at least makes it possible to keep going. For what it's worth.

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