interpo
Piecewise cubic hermite spline interpolating polynomials (pchips) for Node.js.
Usage
var interpo = ; var pchip = 1 2 3 4 5 1 7 11 14 28; pchip; // 11pchip; // 15.464470588
Details
Interpolates 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.
API
new interpo.Pchip(x, f)
Creates a new PchipInterpolator
approximating some function f(x) defined
by the given data points.
-
x
numeric array
an array of strictly increasing x values for the known data points -
f
numeric array
an array of f(x) values for the known data points
PchipInterpolator#evaluate(x)
x
numeric
an x value at which to evaluate the interpolant
Installation
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!
GNU Fortran
Debian/Ubuntu
Just install the gfortran
package and you're good to go:
sudo apt-get install gfortran
OS X
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
Changelog
v1.0.1
July 1, 2017. Support for Node v0.12, v4, v5, v6, v7, and v8.
v1.0.0
June 24, 2017. First release.