I have a branch on github that implements a monotonic interpolation from a 1990 paper by Steffen. I use it on my personal computer, and it's supposed to be in the next release of GSL.
https://github.com/jfcaron3/gsl-steffen-devel Jean-François On 2/5/15, Gideon Simpson <gideon.simp...@gmail.com> wrote: > Pep any of the currently implemented interpolation routines preserve > monotonicity, like pchip (piecewise cubic hermite) does? > > -gideon >
