The automatic evalf logic in Function only calls evalf if every
argument is a float. It wasn't really designed for functions like
besselj where one argument is supposed to be an integer. It should
probably be updated to also automatically evalf if one argument is a
float and the rest are integers.
Aaron Meurer
On Mon, Jun 19, 2023 at 5:29 PM David Bailey wrote:
>
> I wonder if anyone here can explain why some mathematical functions -
> e.g. sin and gamma evaluate completely if given a floating point
> argument, while others such as besselj(0,0.2) only evaluate completely
> if .evalf() is used.
>
> Is this behaviour intentional?
>
> Best Wishes,
>
> David
>
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