#4496: Plot doesn't allow variable outside tuple after lambda
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Reporter: kcrisman | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-3.2.1
Component: graphics | Keywords:
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All of the following work fine in 3.2.alpha0:
{{{
sage: plot(lambda x: x,(x,-1,1))
sage: plot(lambda x: x,-1,1)
sage: plot(x,x,-1,1)
sage: plot(x,-1,1)
}}}
But this doesn't:
{{{
sage: plot(lambda x: x,x,-1,1)
verbose 0 (3400: plot.py, plot) there were 3 extra arguments (besides
<function <lambda> at 0x11a22f70>)
---------------------------------------------------------------------------
UnboundLocalError Traceback (most recent call
last)
<snip>
.../sage-3.2.alpha0/local/lib/python2.5/site-packages/sage/plot/plot.pyc
in plot(funcs, *args, **kwds)
3601 if do_show:
3602 G.show()
-> 3603 return G
3604
3605 def _plot(funcs, xrange, parametric=False,
UnboundLocalError: local variable 'G' referenced before assignment
}}}
Upon further examination, it seems that the culprit is that
SymbolicVariable has a plot method, but lambda functions do not. This is
easy to fix, by changing plot() in plot.py to handle this, for the n==3
args case.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4496>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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