plot(f,(x,-1,2),adaptive=False, num_of_points=200)
this should work
On Friday, March 17, 2017 at 1:20:07 PM UTC-7, bonc...@udel.edu wrote:
>
> Plotting a Piecewise function fails. I've pasted the markdown from my
> ipython notebook:
>
> ```python
> from sympy import *
> init_session()
> ```
>
> IPython console for SymPy 1.0 (Python 3.6.0-64-bit) (ground types:
> python)
>
> These commands were executed:
> >>> from __future__ import division
> >>> from sympy import *
> >>> x, y, z, t = symbols('x y z t')
> >>> k, m, n = symbols('k m n', integer=True)
> >>> f, g, h = symbols('f g h', cls=Function)
> >>> init_printing()
>
> Documentation can be found at http://docs.sympy.org/1.0/
>
> ```python
> f = Piecewise((0,x<0), (1,x<1), (0,True))
> print(f.subs(x,-0.5), f.subs(x,0.5), f.subs(x,1.5))
> plot(f,(x,-1,2))
> ```
>
> 0 1 0
>
>
>
>
> ---------------------------------------------------------------------------
>
> TypeError Traceback (most recent call
> last)
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/experimental_lambdify.py
>
> in __call__(self, args)
> 193 #The result can be sympy.Float. Hence wrap it with
> complex type.
> --> 194 result = complex(self.lambda_func(args))
> 195 if abs(result.imag) > 1e-7 * abs(result):
>
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/experimental_lambdify.py
>
> in __call__(self, *args, **kwargs)
> 310 def __call__(self, *args, **kwargs):
> --> 311 return self.lambda_func(*args, **kwargs)
> 312
>
>
> <string> in <lambda>(x0)
>
>
> TypeError: '<' not supported between instances of 'complex' and 'int'
>
>
> During handling of the above exception, another exception occurred:
>
>
> TypeError Traceback (most recent call
> last)
>
> <ipython-input-2-447f720245d0> in <module>()
> 1 f = Piecewise((0,x<0), (1,x<1), (0,True))
> 2 print(f.subs(x,-0.5), f.subs(x,0.5), f.subs(x,1.5))
> ----> 3 plot(f,(x,-1,2))
>
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/plot.py
> in plot(*args, **kwargs)
> 1282 plots = Plot(*series, **kwargs)
> 1283 if show:
> -> 1284 plots.show()
> 1285 return plots
> 1286
>
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/plot.py
> in show(self)
> 183 self._backend.close()
> 184 self._backend = self.backend(self)
> --> 185 self._backend.show()
> 186
> 187 def save(self, path):
>
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/plot.py
> in show(self)
> 1016
> 1017 def show(self):
> -> 1018 self.process_series()
> 1019 #TODO after fixing
> https://github.com/ipython/ipython/issues/1255
> 1020 # you can uncomment the next line and remove the
> pyplot.show() call
>
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/plot.py
> in process_series(self)
> 895 # Create the collections
> 896 if s.is_2Dline:
> --> 897 collection =
> self.LineCollection(s.get_segments())
> 898 self.ax.add_collection(collection)
> 899 elif s.is_contour:
>
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/plot.py
> in get_segments(self)
> 501 list_segments.append([p, q])
> 502
> --> 503 f_start = f(self.start)
> 504 f_end = f(self.end)
> 505 sample([self.start, f_start], [self.end, f_end], 0)
>
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/experimental_lambdify.py
>
> in __call__(self, args)
> 227
> use_evalf=True,
> 228
> complex_wrap_evalf=True)
> --> 229 result = self.lambda_func(args)
> 230 warnings.warn('The evaluation of the
> expression is'
> 231 ' problematic. We are trying a
> failback method'
>
>
>
> /Users/boncelet/anaconda/lib/python3.6/site-packages/sympy/plotting/experimental_lambdify.py
>
> in __call__(self, *args, **kwargs)
> 309
> 310 def __call__(self, *args, **kwargs):
> --> 311 return self.lambda_func(*args, **kwargs)
> 312
> 313
>
>
> <string> in <lambda>(x0)
>
>
> TypeError: '<' not supported between instances of 'complex' and 'int'
>
>
>
> ```python
>
> ```
>
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