Re: Inflection Point Detection

[aegreen]

bpabbott wrote:
> 
> One approach would be to use mkpp, ppder, and ppval. I haven't tested
> this, but ...
> 
>       pp = mkpp (x, y);
>       pp2 = ppder (ppder (pp));
>       d2y_by_dx2 = ppval (pp2, x);
>       n = find (abs (d2y_by_dx2) == max (abs (d2y_by_dx2)));
>       x_inflection = x(n)
> 
> Ben
> 

I can't seem to get the first step to work. mkpp requires parameters of X, P
or X, P, D. Where P are coefficients? Sorry I am not very familiar with this
at all. I appreciate all the help.


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