Piecewise cubic hermite spline interpolating polynomials (pchips) for Node.js.
var interpo = require("interpo");
var pchip = new interpo.Pchip(
[1, 2, 3, 4, 5],
[1, 7, 11, 14, 28]);
pchip.evaluate(3); // 11
pchip.evaluate(4.2); // 15.464470588Interpolates known data points with a monotonic cubic spline.
See scipy's PchipInterpolator for mathematical details. Note that interpo does not use scipy's algorithm—you may observe slight differences between scipy's interpolants and ours. We instead link against the SLATEC PCHIP library.
Creates a new PchipInterpolator approximating some function f(x) defined
by the given data points.
-
xnumeric array
an array of strictly increasing x values for the known data points -
fnumeric array
an array of f(x) values for the known data points
xnumeric
an x value at which to evaluate the interpolant
npm install interpo
interpo links against an ancient Fortran mathematical library, SLATEC. You'll need GNU Fortran installed to compile this module.
Other Fortran compilers are not supported at this time. PRs welcome!
Just install the gfortran package and you're good to go:
sudo apt-get install gfortran
You'll need to get a version of gfortran that matches the version of your
gcc. The easiest way to do this is to use Homebrew to replace your entire
GCC stack:
brew install gcc
brew link --force gcc
July 1, 2017. Support for Node v0.12, v4, v5, v6, v7, and v8.
June 24, 2017. First release.