[Maxima-bugs] [ maxima-Bugs-3517034 ] polarform error on simple case

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Bugs item #3517034, was opened at 2012-04-11 14:59
Message generated for change (Tracker Item Submitted) made by macrakis
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Category: Lisp Core - Complex
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: polarform error on simple case

Initial Comment:
expr: (a+1)/2 - a/2 - 1/2
polarform(expr) => ERROR atan2(0,0) has been generated
same for carg(expr)

expr is a simple syntactically real expression, and is equal to 0 (ratsimp performs the simplification)
The polarform of 0 is 0.

Bug is in absarg, which blindly assumes expr is non-zero.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3517034&group_id=4933