Here is a workaround to get to the numbers:
In [1]: import sympy as sm
In [2]: from sympy.physics.vector import ReferenceFrame
In [3]: A = ReferenceFrame('A')
In [4]: v = 2*sm.cos(12) * A.x + 3 * sm.sin(-0.2) * A.y
In [5]: v
Out[5]: 2*cos(12)*A.x - 0.596007992385184*A.y
In [6]: v.evalf()
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-6-38d207479e53> in <module>()
----> 1 v.evalf()
AttributeError: 'Vector' object has no attribute 'evalf'
In [7]: v.to_matrix(A).evalf()
Out[7]:
Matrix([
[ 1.68770791746498],
[-0.596007992385184],
[ 0]])
moorepants.info
+01 530-601-9791
On Mon, Oct 1, 2018 at 1:42 PM Jason Moore <moorepa...@gmail.com> wrote:
> I don't think the physics vectors are proper SymPy objects because they
> need to be mutable. evalf() was probably never implemented for them.
>
> Jason
> moorepants.info
> +01 530-601-9791
>
>
> On Mon, Oct 1, 2018 at 12:48 PM Aaron Meurer <asmeu...@gmail.com> wrote:
>
>> Can you try it with the latest version (1.3)? If that doesn't work
>> please open an issue in our issue tracker.
>> https://github.com/sympy/sympy/issues/new
>>
>> Aaron Meurer
>> On Mon, Oct 1, 2018 at 12:39 PM scurrier <shaun.curr...@gmail.com> wrote:
>> >
>> > That didn't work for me in SymPy 1.1.1.
>> >
>> > AttributeError: 'Vector' object has no attribute 'evalf'
>> >
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