[portland] Any Mathematical Coders Here?

mark gross markgross at thegnar.org
Thu May 8 15:22:26 CEST 2008

On Thu, May 08, 2008 at 05:58:54AM -0700, Rich Shepard wrote:
> On Wed, 7 May 2008, mark gross wrote:
>> I know enough to get into trouble.  But I don't know what a sigmoind cure
>> is other than http://mathworld.wolfram.com/SigmoidFunction.html which
>> isn't very helpful.
>   No, the sigmoidal function doesn't work.
>> If you are substituting in arctan's for this curve then I have to think
>> you are looking for something that "looks" like something as opposed to
>> something that means anything.
>   Arctan doesn't work, either. I need a function which will provide a y
> value for any given x value in the domain.

?  you must be thinking of some "new math" where atan is not a
function.  (sure you need to pick a branch cut for its domain, but so what?)

You need to be much more forthcoming with the problem before I can
oelp you.


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