[Maxima-bugs] [ maxima-Bugs-1540354 ] simplification of float to fractional power (simpexpt)

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Bugs item #1540354, was opened at 2006-08-14 22:38
Message generated for change (Comment added) made by dgildea
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Category: Lisp Core - Simplification
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Robert Dodier (robert_dodier)
Assigned to: Nobody/Anonymous (nobody)
Summary: simplification of float to fractional power (simpexpt)

Initial Comment:
Split off from [ 1372264 ] no user doc for 'numer_pbranch':

Bigfloat:

(%i19) (-2.0b0)^(2/3);
(%o19) 1.374729636998603B0*%i-7.937005259840998B-1

Float:

(%i20) (-2.0)^(2/3);
(%o20) 2^(2/3)

5.9.3cvs / Clisp 2.38: (-2.0)^(2/3) => 1.0*2^(2/3)$



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>Comment By: Dan Gildea (dgildea)
Date: 2007-11-18 15:35

Message:
Logged In: YES 
user_id=1797506
Originator: NO

Conversion to rational fixed in simp.lisp rev 1.44:

(%i17) (-2.0)^(2/3);
(%o17) 1.587401051968199

discrepancy with bfloat is tracked by bug 619927.


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