#7122: plot real part and imaginary part of function sqrt.
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Reporter: fmaltey | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.2
Component: graphics | Keywords:
Reviewer: | Author:
Merged: |
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I try to plot a half-circle with the
{{{
var('m')
parametric_plot ([real(m+sqrt(1-m^2)), imaginary(m+sqrt(1-m^2))],m,-1,1)
}}}
and get a severe error.
Theses plots are right :
{{{
plot([sqrt(m2+1)],m,0,6)
plot(real (sqrt(m2+1)),m,0,6)
}}}
But this one with AND real(...) or imaginary(...) AND list AND sqrt(...)
fails :
{{{
plot([real (sqrt(m2+1))],m,0,6)
}}}
On devel-support kcrisman proposes :
After looking at the traceback about an extra argument, I have a
sneaky suspicion this is because sqrt takes an extra keyword prec,
which perhaps is getting caught up in fast_float somehow. What's
interesting is that the problem also only shows up for a list, so
again fast_float([]) is what's getting concerned. Those who know how
fast_float and the expression trees work will hopefully check this out as
they get an opportunity.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7122>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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