FWIIW there's a splines mini package here: https://www.astro.umd.edu/~jph/J_page.html
-SL On Fri, May 7, 2021 at 11:58 AM 'Rudolf Sykora' via Programming < [email protected]> wrote: > Dear Raul, > > > thanks for your writing, and also for directing this from the general to > the programming forum, where I probably should have posted it. > > On the topic. I am afraid you misunderstood what I meant. The data > as a whole do not follow a simple trend, like lying on a line. they can > be even quite random. The task is to go from > > X: 0 5 6 26 > Y: 10 _10 80 100 > > to, say: > > U: 0 5 10 15 20 25 30 NB. Equidistant mesh. > V: 10 _10 84 90 94 99 104 NB. Linear interpolation and extrapolation > when needed. > NB. The numbers with U>5 are rounded here for > readability. > NB. If U=26 were, by chance, in the mesh, > NB. the value would be (exactly) 100. > > (This is not what the data look like in reality, but as an example it > could suffice.) > > Thanks once more! > > > Ruda > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
