Discussion between Nobody Needs Names and xnor

Feeds

06:58

Python Submission, This is the minimum. PROVED. Program 1, Function \$f\left(x\right)=\left|x\right|\$, 3 Bytes abs Program 2, Function \$g\left(x\right)=\text{id}\left(x\right)\$, 2 Bytes id Total Size: \$3+2=5\text{ Bytes}\$ Explanation: For all integer x, id(x) returns a different positive num...

Nobody Needs Names

All negative numbers.

xnor

@Adám You might be thinking that id here is the identity function, whereas it's actually Python's built-in to get the "identity" of an object, that is its memory address.

Nobody Needs Names

Yes indeed. The definition for id satisfies that id(1)!=id(-1).

BTW, what's an identity function? Like, lambda *args: 0?

xnor

@NobodyNeedsNames identity=lambda x:x

Though, id is weird in ways that suggest it's not a pure function in the mathematical sense, in that it can give different results each run, or for two variables holding the same number, as seen here.

Nobody Needs Names

Oh OK, but who would need THAT function...?

@xnor so is it valid? or do I have to ask the OP?

(+, can you tell me what OP stands for)

Anders Kaseorg

06:59

OP = original poster. The OP did say “given the same input, it must produce the same output”. The id function doesn’t satisfy that.

Nobody Needs Names

well

what does the "same input" mean

Anders Kaseorg

OP also said ‘Interpret "function" in the mathematical sense.’

Nobody Needs Names

surely if you put in different variables it isn't the "same input"...

Anders Kaseorg

The mathematical sense is ℤ → ℤ, not (Python variable) → (Python variable).

Nobody Needs Names

oh ok

I will change that

@AndersKaseorg Is there a trivial way to edit it?

Anders Kaseorg

07:03

You’ll have to come up with a function other than id. I think it’s clear that any use of id is banned by this challenge.

Nobody Needs Names

ok..

pxeger

ato.pxeger.com/…

> they must be pure (given the same input, it must produce the same output)

Nobody Needs Names

well, that depends on wdym by "same input"

Anders Kaseorg

There really isn’t any wiggle room here. The OP made it clear in both the spirit and the letter of the challenge that they’re talking about mathematical integers.

Nobody Needs Names

@pxeger .

I'm convinced but I will wait for the OP.

@AndersKaseorg .

pxeger

07:17

My 6-byte Zsh answer was invalid for a similar reason: f(07) ≠ f(7), even though 07 = 7. (Apart from the fact it wasn't valid anyway, because I'm not awake)

Nobody Needs Names

hahaha

OIC cjquine is here