ndarray-linear-interpolate

Multilinear (ie bilinear/trilinear) interpolation for ndarrays.

Example

var ndarray = require("ndarray")
var interp = require("ndarray-linear-interpolate")

var x = ndarray(new Float32Array(9), [3, 3])
x.set(1, 1, 1.0)

for(var u=0.0, u<=3.0; u+=0.25) {
  var row = []
  for(var v=0.0; v<=3.0; v+=0.25) {
    row.push(interp(x, u, v))
  }
  console.log(row.join(" "))
}

//Prints out:
//
//    0 0 0 0 0 0 0 0 0 0 0 0 0
//    0 0.0625 0.125 0.1875 0.25 0.1875 0.125 0.0625 0 0 0 0 0
//    0 0.125 0.25 0.375 0.5 0.375 0.25 0.125 0 0 0 0 0
//    0 0.1875 0.375 0.5625 0.75 0.5625 0.375 0.1875 0 0 0 0 0
//    0 0.25 0.5 0.75 1 0.75 0.5 0.25 0 0 0 0 0
//    0 0.1875 0.375 0.5625 0.75 0.5625 0.375 0.1875 0 0 0 0 0
//    0 0.125 0.25 0.375 0.5 0.375 0.25 0.125 0 0 0 0 0
//    0 0.0625 0.125 0.1875 0.25 0.1875 0.125 0.0625 0 0 0 0 0
//    0 0 0 0 0 0 0 0 0 0 0 0 0
//    0 0 0 0 0 0 0 0 0 0 0 0 0
//    0 0 0 0 0 0 0 0 0 0 0 0 0
//    0 0 0 0 0 0 0 0 0 0 0 0 0
//    0 0 0 0 0 0 0 0 0 0 0 0 0
//

Install

npm install ndarray-linear-interpolate

`require("ndarray-linear-interpolate")(array, x, y, z, ...)`

Interpolates values on an ndarray.

array the array to interpolate from
x, y, z... the coordinate to evaluate the interpolated grid at

Returns The multilinearly interpolated value

Note To avoid the overhead of variable arguments, special interfaces are available for 1, 2 and 3 dimensions. You can access these using:

require("ndarray-linear-interpolate").d1
require("ndarray-linear-interpolate").d2
require("ndarray-linear-interpolate").d3

Credits

Current Tags

1.0.0 ... latest (11 years ago)

4 Versions

1.0.0 ... 11 years ago
0.0.2 ... 11 years ago
0.0.1 ... 11 years ago
0.0.0 ... 12 years ago