# Any shame in using Penner's equations?
**URL:** https://forum.kirupa.com/t/any-shame-in-using-penners-equations/62971
**Category:** flash
**Created:** [September 1, 2004, 11:57pm UTC](https://forum.kirupa.com/t/any-shame-in-using-penners-equations/62971 "2004-09-01T23:57:59Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@H4T](https://forum.kirupa.com/u/H4T)
#### Post date: [September 1, 2004, 11:57pm UTC](https://forum.kirupa.com/t/any-shame-in-using-penners-equations/62971/1 "2004-09-01T23:57:59Z")
For those of you familiar with Robert Penner’s easing equations, do you feel any shame using them? I mean, do you think that people who use Penner’s formulas are unoriginal and such?
I like the equations, but I don’t like taking someone else’s code and using it (with credit of course)…but then again, I don’t have the math skills just yet to create my own formulas…hm. So, does anyone see anything wrong with using Penner’s (or anyone else’s) equations?
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### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [September 2, 2004, 3:35am UTC](https://forum.kirupa.com/t/any-shame-in-using-penners-equations/62971/2 "2004-09-02T03:35:37Z")
What’s wrong by using Penner’s equation?
I bought his book, I like it, if I use his script I put like this:
//The following easing is written by Penner.
Why would you reinvent the wheel, anyway? If I use E=mc2 it doesn’t mean that I claim I wrote that.
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### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [September 2, 2004, 9:12am UTC](https://forum.kirupa.com/t/any-shame-in-using-penners-equations/62971/3 "2004-09-02T09:12:29Z")
Most of his equations (at least the originals that I’m familiar with) are just “the way its done.” Want to go to frame two? Use gotoAndPlay(2). Want a linear tween? Use the equation penner used for linear a tween. If you took the time to write it on your own, it’d pretty much be exactly the same. Penner just provides a collection that doesn’t require people to write them out on their own and instead just copy and paste.
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### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [September 2, 2004, 9:53am UTC](https://forum.kirupa.com/t/any-shame-in-using-penners-equations/62971/4 "2004-09-02T09:53:50Z")
It is a formula for movement. What you do with that formula creates the artform.
Also you don’t need to buy the book to get the AS guides:
[http://www.robertpenner.com/easing/](http://www.robertpenner.com/easing/)