Changing the meaning of /

asked 2022-10-12 01:04:05 +0100

John L
51 ●2 ●4 ●8

I have a program that makes some calculations in a ring R, where R may be either approximate real numbers (for which I am using RealField(20), or approximate p-adic numbers, for which I use Zp(p,prec=numbits).

I need to do division. If R is RealField, I can just use /, but // is undefined. If R is Zp, / complains if the denominator is a non-unit. Fine, this makes sense, but I want it to makes its best guess, which is implemented by //.

Anyway, the formulas I have involve dividing. I'd rather use the same functions for some calculations, no matter what R is. How can I overload / in Zp to do what // does, even in the case of non-units? Or // in RealField() to be /?

answered 2022-10-12 01:31:51 +0100

Max Alekseyev

6560 ●9 ●47 ●155

You can just can try / and if there is an exception, do // instead - like:

try:
    result = x / y
except ZeroDivisionError:
    result = x // y

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Sure, this will work, but then I have to do it in every single line that involves division. There are a lot of them, it's not just one single line in the function. I'm hoping for a more efficient method that making two copies of the entire algorithm.

John L ( 2022-10-12 02:00:03 +0100 )edit

Define a division function and call it in place of /

Max Alekseyev ( 2022-10-12 06:15:51 +0100 )edit

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