How do I detect if something is equal to NaN?

[snapenilk]

I thought is was a simple solution, but it didn't end up working.
I was trying to find out why it didn't work, but I found something else weird:

<((0) / (0)) = ((0) / (0))> //false
script variables ((a) :: grey) ((b) :: grey) :: grey
set [a v] to ((0) / (0))
set [b v] to ((0) / (0))
report <(a) = (b)> :: control cap //true

[cymplecy]

Yep - the OP found that my initial solution behaved differently when a variable is involved

[bh]

@snapenilk

but I found something else weird

Oh, that is strange! It didn't surprise me that a=a reported true, and it wouldn't surprise me if SET B TO A made a=b true, but two different 0/0 results shouldn't be equal, you're right.

[ego-lay_atman-bay]

I think this is even more weird

usually the identical to block is better for detecting exact replicas, but...

[bh]

Yup, okay, when the conference is over I'll look into this...

[ego-lay_atman-bay]

I looked into it a bit, and I found out that...

apparently when you try to store a NaN value in a variable, it turns into 0

[snapenilk]

That explains everything.

[ego-lay_atman-bay]

I'm now thinking that to detect if something is NaN, you can use lambda,

and in order to do this is a custom block, you use an unevaluated input

[ashtyboi]

How do you do it without using an unevaluated input?

[helicoptur]

You can't really.

[ego-lay_atman-bay]

yeah, I meant lambda