Thank you  Chris & Patrick.   My splines don't mathematically enhance that  that's  already available.   I  will need  to improve  my  file searching  technique on  that "work" operating system,  for I'd  have found spline.ijs right away on Linux.

> Date: Sun, 17 Mar 2019 06:48:07 -0700
> From: chris burke <[email protected]>
> Message-ID:
> <caak_udxw3zmgojhbx4rihbbzxhsmpdcbqpjoeeupdtyyc_z...@mail.gmail.com>
>
> Thanks. There are spline functions already in ~addons/math/misc/spline.ijs.

> From: "J. Patrick Harrington" <[email protected]>
> Message-ID: <[email protected]>
>
> I use splines all the time for various puposes. You can find a bunch
> of variations on my web page at http://www.astro.umd.edu/~jph/splines.ijs
> There is also a least squares spline routine on my page
> (http://www.astro.umd.edu/~jph/J_page.html) down at the bottom.

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