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This package implements a variety of interpolation schemes for the Julia language. It has the goals of ease-of-use, broad algorithmic support, and exceptional performance.
Currently this package's support is best for B-splines and also supports irregular grids. However, the API has been designed with intent to support more options. Pull-requests are more than welcome! It should be noted that the API may continue to evolve over time.
Other interpolation packages for Julia include:
Some of these packages support methods that
Interpolations does not, so if you can't find what you need here, check one of them or submit a pull request here.
using Pkg Pkg.add("Interpolations")
from the Julia REPL.
Create a grid
xs and an array
A of values to be interpolated
xs = 1:0.2:5 f(x) = log(x) A = [f(x) for x in xs]
Create linear interpolation object without extrapolation
interp_linear = LinearInterpolation(xs, A) interp_linear(3) # exactly log(3) interp_linear(3.1) # approximately log(3.1) interp_linear(0.9) # outside grid: error
Create linear interpolation object with extrapolation
interp_linear_extrap = LinearInterpolation(xs, A,extrapolation_bc=Line()) interp_linear_extrap(0.9) # outside grid: linear extrapolation