Getting the denominator and numerator

[Peter Stahlecker]

I get an expression in sympy which looks like f(x) / g(x) when I print it.

Is there any way to get f(x) and g(x) explicitly?

Thanks for any help!

[Qijia Liu]

f,g=expr.as_numer_denom()

[Peter Stahlecker]

Dear Liu,

Thanks for your prompt reply!

I tried as you suggested, where speedx is the expression, whose numerator and denominator I want to get.

I got the error below.

If I do it without ‚sm.‘, I get the error message expr not known.

Thanks for your further help!

AttributeError                            Traceback (most recent call last)
Input In [7], in <module>
     83 print(speedx)
     84 print(speedy)
---> 85 f, g = sm.expr.as_numer_denom(speedx)
     86 print(r, g)
     88 q = [q1, q2, q3]

AttributeError: module 'sympy' has no attribute 'expr'

On Mon 21. Mar 2022 at 10:34 Qijia Liu <liu...@pku.edu.cn> wrote:

f,g=expr.as_numer_denom()

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Best regards,

Peter Stahlecker

[Peter Stahlecker]

I managed to get it.

Thanks a lot for your help!!