#10062: With imag, sqrt and subs I get 0==1
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Reporter: fmaltey | Owner: burcin
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.11
Component: calculus | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Burcin Erocal | Merged in:
Dependencies: | Stopgaps:
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Changes (by burcin):
* status: needs_info => needs_review
* milestone: sage-5.10 => sage-5.11
Old description:
> I use Sage 4.5.3
>
> {{{
> var('m') ; y=sqrt(m^2-1)
> y(m=0) # =I, is right
> imag(y) # =.... feels right, arctan2(0,-1)=pi when m=0
> imag(y(m=0)) # =1, is right
> (imag(y))(m=0) # is 0 and I don't understand why !
> }}}
New description:
I use Sage 4.5.3
{{{
var('m') ; y=sqrt(m^2-1)
y(m=0) # =I, is right
imag(y) # =.... feels right, arctan2(0,-1)=pi when m=0
imag(y(m=0)) # =1, is right
(imag(y))(m=0) # is 0 and I don't understand why !
}}}
Apply [attachment:trac_10062-doctest.sage-5.10.beta5.patch]
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Comment:
The underlying problem #7160 was finally fixed (by #13213). Please review
this simple doctest patch.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10062#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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