sympy's atan2 not full numerical evaluation

Question

I am using sympy's atan2 and for certain values it isn't giving me the full numerical evaluation but giving me a (value + pi)

from sympy import atan2
print(atan2(0.0037, -0.056))

gives the following output:

-0.0659755361339305 + pi

I want the code to give the numberical value without the "+ pi", in this case 3.07402446387

mpmath's mpf function solves this issue but gives me error messages in other parts of my code. Is there another way of doing this?

Try using the numerical conversion functions/methods of sympy; see [here](http://docs.sympy.org/dev/modules/evalf.html). Of course, you can always use the equivalent `numpy` function, which is probably faster. — Stelios, Jun 29 '17 at 10:56

score 2 · Accepted Answer · answered Jun 29 '17 at 14:15

2

from sympy import atan2
print(atan2(0.0037, -0.056).evalf())

Does excatly what you want.

from sympy import atan2
print(atan2(0.0037, -0.056).evalf(30))

Gives you the numerical result with 30 digits precision.

answered Jun 29 '17 at 14:15

laolux

1 Answers1