polytrans & polyscale

[Ben Abbott]

On Apr 8, 2009, at 3:05 AM, Jaroslav Hajek wrote:

> hi,
>
> I recently added the functions polytrans (p(x) -> p(x+a)) and
> polyscale (p(x) -> p(x*a)) to the scripts/polynomial, though they are
> not yet added to the build process. Does anyone object to adding these
> functions definitely? These are not in Matlab core, but then neither
> is a number of other polynomial functions (polyint, polyout...).
> Opinons wanted.
>
> regards

I'd like to see them added to the core as well.

As pointed out by Thorsten these functions are implicitly implemented  
in polyfit/polyval already. I had the privilege of adding this  
functionality and had considered introducing such functions at that  
time.

Beyond that, I commonly make use of polynomials in my work. My two  
most common polynomial related problems are cure-fitting, and solving  
DEs (electrostatics in particular).  Thus from my position these have  
broad application and would be useful to have in Octave's core.

Ben