Unexpected truncation to integer when using evalf()

[Jeremie Knuesel]

Hi,

In the following example, the value returned is e^1 instead of e^1.9:

Sum(1.9**k/factorial(k), (k, 0, oo)).evalf()

Is this a bug or am I doing something wrong?

Note that I get the expected value when doing

Sum(x**k/factorial(k), (k, 0, oo)).doit().subs(x,1.9)

Best regards,

Jeremie Knuesel

[Aaron Meurer]

That's definitely a bug. Can you open an issue for it?

Aaron Meurer

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[Jeremie Knuesel]

Done, thanks.

[Ondřej Čertík]

On Thu, Sep 28, 2017, at 08:22 AM, Jeremie Knuesel wrote:
> Done, thanks.

Here is the issue for reference:

https://github.com/sympy/sympy/issues/13365

Ondrej