#6926: multiple bugs in plotting symbolic expressions
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Reporter: was | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.2
Component: graphics | Keywords:
Reviewer: | Author:
Merged: |
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This is a bug:
{{{
sage: plot(abs(exp(i*x)), xmin=1,xmax=2)
Traceback (most recent call last):
...
TypeError: float() argument must be a string or a number
}}}
The above should never happen, since the outputs of the function should be
floats.
Doing the obvious workaround yields another totally different bug!
{{{
sage: plot(lambda x: float(abs(exp(i*x))), xmin=1,xmax=2)
Traceback (most recent call last):
...
ZeroDivisionError: float division
}}}
The above ZeroDivisionError comes from trying incorrectly to scale the
y-axis!
The following works, where we do two things explicitly, both of which
should be completely automatic.
{{{
sage: plot(lambda x: float(abs(exp(i*x))), xmin=1,xmax=2, ymin=0,ymax=1)
}}}
This was reported by Andi Walz on sage-support.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6926>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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