Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**pisquared****Member**- Registered: 2011-08-25
- Posts: 10

I've found a cool function: -|x|^(-|x|)

This function goes in waves over and under the point 0 of the X acces. If you go towards the negative or positive part of the X access the waves get smaller and it looks like in the end it'll be a straight line but it will only get smaller and smaller.

How many times can you subtract 7 from 83, and what is left afterwards? You can subtract it as many times as you want, and it leaves 76 every time. ~Author Unknown

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,942

Hi pisquared;

What did you graph it with?

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**pisquared****Member**- Registered: 2011-08-25
- Posts: 10

I sketched it in a notebook with a pen.

You probably expected me to tell you a name of a computer programme lol...

How many times can you subtract 7 from 83, and what is left afterwards? You can subtract it as many times as you want, and it leaves 76 every time. ~Author Unknown

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,942

Hi;

Hand methods can be misleading because they cannot sample enough points.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**pisquared****Member**- Registered: 2011-08-25
- Posts: 10

I know, but I couldn't find a programme that doesn't cost money or actually works with the small details.

Maybe you can recommend one?

*Last edited by pisquared (2011-08-25 23:16:19)*

How many times can you subtract 7 from 83, and what is left afterwards? You can subtract it as many times as you want, and it leaves 76 every time. ~Author Unknown

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,942

Hi;

Try geogebra.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,918

here is the graph that wolfram gives:

http://www.wolframalpha.com/input/?i=pl … %28x%29%29

*Last edited by anonimnystefy (2011-08-25 23:54:30)*

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

Or put -abs(x)^(-abs(x))-y into: Equation Grapher

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**pisquared****Member**- Registered: 2011-08-25
- Posts: 10

Thanks alot everyone!

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,942

Hi pisquared;

That function is actually rather well behaved. It is easy to numerically integrate it.

**In mathematics, you don't understand things. You just get used to them.**

Offline

**reconsideryouranswer****Member**- Registered: 2011-05-11
- Posts: 172

pisquared wrote:

"...over and under the point 0 of the

X acces.

If you go towards the negative or positive part of the X access..."

Signature line:

I wish a had a more interesting signature line.

Offline

**pisquared****Member**- Registered: 2011-08-25
- Posts: 10

Sorry, I live in Israel and barely know English.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,942

Hi pisquared;

That is okay, your English is rather good.

**In mathematics, you don't understand things. You just get used to them.**

Offline

**pisquared****Member**- Registered: 2011-08-25
- Posts: 10

I'm glad you think that

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,942

Hi;

Looks like a hamburger! A delicious one!

**In mathematics, you don't understand things. You just get used to them.**

Offline

bobbym wrote:

Hi;

Looks like a hamburger! A delicious one!

Hi,

The boundary curve is a superellipse: (x/4)^4 + (y/3)^4 = 1.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,942

Hi benice;

Thanks for the info. A superellipse? I never heard of that.

What is it?

**In mathematics, you don't understand things. You just get used to them.**

Offline

**pisquared****Member**- Registered: 2011-08-25
- Posts: 10

Hey benice,

Wow! What programme did you use?

and bobbym,

I agree, it looks like a pink delicious hamburger!

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,942

Hi pisquared;

Yes, perhaps a little on the rare side but there is an easy fix for that!

Hi benice;

Did not notice the link to the superellipse page.

Thanks for providing that.

**In mathematics, you don't understand things. You just get used to them.**

Offline

pisquared wrote:

Hey benice,

Wow! What programme did you use?

UDAV (universal data array visualization)

It's free!

Offline

Pages: **1**