I wrote a class with a __call__ method, and I want to plot an instance of
it using plot() in the sage notebook. I run the commands:
import circle_homeo
import cyclic_order
h = circle_homeo.PSL2R_action(cyclic_order.CyclicOrder('abAB'))[0]
(this doesn't matter; all that should matter is that h is some callable
class)
plot(h, xmin=0, xmax=1)
returns the error:
*****************************************
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_32.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
-*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("cGxvdChoLCB4bWluPTAsIHhtYXg9MSk="),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpnBGA3K/___code___.py", line 3, in <module>
exec compile(u'plot(h, xmin=_sage_const_0 , xmax=_sage_const_1 )
File "", line 1, in <module>
File
"/home/akwalker/Documents/software/sage-5.3/local/lib/python2.7/site-packages/sage/misc/decorators.py",
line 692, in wrapper
return func(*args, **kwds)
File
"/home/akwalker/Documents/software/sage-5.3/local/lib/python2.7/site-packages/sage/misc/decorators.py",
line 537, in wrapper
return func(*args, **options)
File
"/home/akwalker/Documents/software/sage-5.3/local/lib/python2.7/site-packages/sage/plot/plot.py",
line 1130, in plot
G = _plot(funcs, (xmin, xmax), **kwds)
File
"/home/akwalker/Documents/software/sage-5.3/local/lib/python2.7/site-packages/sage/plot/plot.py",
line 1236, in _plot
funcs, ranges = setup_for_eval_on_grid(funcs, [xrange],
options['plot_points'])
File
"/home/akwalker/Documents/software/sage-5.3/local/lib/python2.7/site-packages/sage/plot/misc.py",
line 148, in setup_for_eval_on_grid
return fast_float(funcs, *vars,**options), [tuple(range+[range_step])
for range,range_step in zip(ranges, range_steps)]
File "fast_eval.pyx", line 1377, in sage.ext.fast_eval.fast_float
(sage/ext/fast_eval.c:9718)
AttributeError: EquivariantRHomeo instance has no attribute '__float__'
*******************************************
However, if I do:
f = lambda x:h(x)
plot(f, xmin=0, xmax=1)
That works fine. Is there something I need to do to the class to convince
plot() to call it?
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