#6388: Logarithm function log(x) is partially broken for x <= 0
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Reporter: gmhossain | Owner:
Type: defect | Status: new
Priority: major | Milestone:
Component: symbolics | Keywords: negative argument, log
Reviewer: | Author:
Merged: |
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Although log(x) function in new symbolics is appeared to be defined for
entire complex plane, it throws out error sometime
(1) Negative argument
{{{
sage: log(-1 + 0*I)
I*pi
sage: log(-1)
...
ValueError: self must be positive
}}}
It behaves differently for mathematically equivalent arguments.
(2) Value of log(x) at x=0
{{{
sage: log(0)
...
ValueError: self must be positive
}}}
log(0) should throw out an unevaluated symbolic expression "log(0)"
instead of raising error. Depending on the way it appears in an
expression, one could use it for simplifications.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6388>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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