[Fixed]1.8.5 Application crash on divby0

[Kilinich]

Edit: (by tatt61880 on 2011.05.15 19:11)
Fixed at v1.9.4. Thanks!

-Tatt
----

How to reproduce:

Draw box
Open script window
Set color to [0.1/0,1,1,1]

Algodoo program will just crash without errors/warnings in log.

[TC42]

Of course it crashes; you can't divide by 0!!

But then again, you are Kilinich, so maybe you can
That is a good bug find; how did you come across it?
Also, you RaRa and Paradigm are all online at once! Awesomeness will ensue.

[electronicboy]

you can divide by zero, but you only get what you want to divide 0 with... Unless your in algodoo

[TC42]

Depends on how you think about it. If you think about it as writing it out by hand, try 5/0. The answer is somewhere above +inf.
But if you think about it from the 1st grade perspective, you take one candy-bar, and divide it into zero pieces and you still have one candy bar.

[electronicboy]

you would use the second one.

5/0 = 5

[Kilinich]

oh common, please stop buzzing, game just shouldn't crash, no matter what.

[Chronos]

oh common, please stop buzzing, game just shouldn't crash, no matter what.

Kilinich, what you're doing is ripping a hole in the universe. What Algodoo is doing by crashing is preventing that. You should be glad, because thanks to it crashing, nothing got destroyed.

Also, when dividing by 0, 0 can go into anything an infinite amounts of times.

[electronicboy]

true, but i thing that the method where
5/0 = 5
Would be the most prefaired method, as that is what we are tought in schools

[Kilinich]

true, but i thing that the method where
5/0 = 5
Would be the most prefaired method, as that is what we are tought in schools

5/0 == +inf
0/0 == NaN

[Bitterkoekje]

To be exact
0/0 = ℝ
because
0/0 = 1
and
0/0 = 2
and
0/0 = 42
and
0/0 = 1337
why?
6/3 = 2
because
2*3 = 6
so
0/0 = ℝ
because
ℝ*0 = 0

[TC42]

This divide-by-zero should have its own thread.

But still, algodoo shouldn't crash for anything!

[Someone Else]

There are indeed many ways to look at dividing by zero.

If you break a candy bar into two pieces, each piece is half a candy bar. So, if you break a candy bar into zreo pieces, then... HEY! YOU HAVE NO CANDY BAR! So, X / 0 = 0.

Say you have a box that is five inches high. If you fill it with sheets of foam that are 1 inch high, you need 5 of them. If you fill it with sheets of graphene that are 0 inches thick, you need INFINITELY MANY OF THEM. So, X / 0 = +inf.

Now, let's say you graph the function Y = X / X. You get a horizontal line at Y = 1, with a hole at X = 0. Fill this hole and you get 0 / 0 = 1.

That last result is also consistent with the box example- a box 0 inches high will fit one 0 inch sheet of graphene.

If anyone has any more ideas on how to look at dividing by 0, let me know. And Algodoo should crash if you create a box that spawns a clone of itself onCollide. And we do not need another topic.

[TC42]

And Algodoo should crash if you create a box that spawns a clone of itself onCollide.

Only if the collideset is the same.

[Kilinich]

Please stop that offtopic.

p.s. Schoolboys, you can learn about infinity later in university or take a quick look to wikipedia
http://en.wikipedia.org/wiki/Limit_of_a_function

[emilk]

Bug shall be fixed in the next version. It is, btw, a general problem with attributes given the value NaN. In this case, the NaN:s come when converting +inf RGB:s to HSV:s