subs should only be used to replace sympy expressions with sympy
expressions. To evaluate a sympy expression at a numpy array, you
should lambdify() it first.
In [10]: f0 = lambdify((a, b, c), f)
In [12]: f0(array1, array2, array3)
Out[12]: array([2, 1, 1])
Aaron Meurer
On Mon, Sep 21, 2015 at 1:01 PM, Ronghai Wu <csu.wurong...@gmail.com> wrote:
> Dear Sympy developers and users,
>
> Could anyone help me with the following problem:
> substitute a, b, c by arrays in expression f = a*b*c. For example, I get
> "ValueError: The truth value of an array with more than one element is
> ambiguous" if running:
> import sympy
> import numpy
> sympy.var('a,b,c')
> f = a*b*c
> array1 = numpy.random.randint(1,3,3)
> array2 = numpy.random.randint(1,3,3)
> array3 = numpy.random.randint(1,3,3)
> f.subs([[a, array1], [b, array2], [c, array3]])
>
> Best Regards
> Ronghai Wu
>
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