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Unable to evaluate erfcinv #24684

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robertmx opened this issue Feb 8, 2023 · 1 comment
Open

Unable to evaluate erfcinv #24684

robertmx opened this issue Feb 8, 2023 · 1 comment
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core.evalf

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@robertmx
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robertmx commented Feb 8, 2023

Evaluating the erfcinv function yields a symbolic expression instead of a numerical approximation.

erfcinv(0.4).evalf()

returns erfcinv(0.4). I would expect the numerical evaluation of the function.
@sylee957
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sylee957 commented Feb 9, 2023

There is no erfcinv implementation in mpmath
https://mpmath.org/doc/current/functions/expintegrals.html
so it could be useful to polyfill that function in core/evalf.py

skirpichev added a commit to skirpichev/diofant that referenced this issue Feb 12, 2023
@skirpichev
functions: add _eval_evalf() helper for erfcinv()
87ebe6f 
Closes sympy/sympy#24684
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