[PD] curve fitting help?

[Chris McCormick]

Hi Dan,

I had a crack based on Joe's and used this solver with your data to get
a close-enough polynomial for expr:

http://www.arachnoid.com/polysolve/

Cheers,

Chris.

On 23/10/14 06:16, Joe White wrote:
> Hey Dan,
> 
> Does the attached patch do what you want? It's a bit crude but you get
> the same graph output, I suppose you could always smooth the data if you
> didn't want it linear as well.
> 
> Cheers,
> Joe
> 
> On 22 October 2014 20:22, Jonathan Wilkes via Pd-list
> <pd-list at lists.iem.at <mailto:pd-list at lists.iem.at>> wrote:
> 
>     Why not just draw what you want the curve to be in an array?
> 
>     -Jonathan
> 
> 
>     On Wednesday, October 22, 2014 2:04 PM, Dan Wilcox
>     <danomatika at gmail.com <mailto:danomatika at gmail.com>> wrote:
> 
> 
>     Howdy all,
> 
>     I’m *almost* done with my rjlib compatible s_minimoog abstraction
>     for the rc-patches, but I need help finding the right curve for the
>     ADSR controls. I used block diagrams and the Minimoog Service Manual
>     to build the dsp chain. What I have now can give a *reasonably*
>     accurate rendition of Minimoog patches from sheets found online (ELP
>     Aquatarkus, for instance). What I did notice in comparing it to the
>     Arturia Mini V AudioUnit minimoog simulation, is that the knob
>     curves for frequency are different form what I’ve been able to do,
>     so some patches aren’t quite *right* yet. 
> 
>     Basically, I’ve tried a number of different exponential and power
>     curves but can’t get one that has the long, low slope on the low
>     end. All of my curves rise too quickly. In any case, this is a curve
>     fitting problem and this is the data I’m working with. The mapping I
>     want is 0 - 1 to 20 0 20kHz. And no, I don’t to just stick a log hsl
>     in there :D
> 
>     Any help would be appreciated so I can get this out there and start
>     using it!
> 
>     posfreq
>     0.0000
>     0.12583
>     0.250362
>     0.375456
>     0.500768
>     0.6251750
>     0.7506300
>     0.87512750
>     1.00025000
> 
> 
> 
> 
>     --------
>     Dan Wilcox
>     @danomatika
>     danomatika.com
>     robotcowboy.com
> 
> 
> 
> 
> 
> 
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-- 
http://mccormick.cx/
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