numfit

v1.0.7

Published

4 months ago

Javascript library for numerical interpolation and extrapolation.

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Numfit is a versatile JavaScript library that excels at numerical interpolation and extrapolation, extending its prowess to solving the coefficients of polynomial equations. It currently boasts nine distinct classes tailored for interpolation and extrapolation tasks:

Linear
Bilinear
Trilinear
Quadratic
Biquadratic
Triquadratic
Cubic
Bicubic
Tricubic

Installation

NodeJS Enviroment

Using NPM

Browser Enviroment

There's a couple ways to use Numfit in you browser based projects:

Using CDN (Recommended)

To harness the library without the complexities of local deployment, consider employing a Content Delivery Network (CDN). Simply incorporate the following script tag into your HTML document's <head> section:

<script src="https://cdn.jsdelivr.net/gh/buca/numfit/build/Numfit.min.js"></script>

Using a Local Copy

Alternatively, you can opt for a local deployment of the library. Locate the /build/ directory within this repository and download either the standard Numfit.js file or the minified version Numfit.min.js. Then, incorporate the downloaded file into your HTML document's <head> section using a <script> tag:

<script src="my-directory/Numfit.min.js"></script>

Replace my-directory with the actual path to the downloaded file.

Basic Usage

const positions = [ 0, 1 ];
const values = [ 0, 0, 0, 255, 255, 255 ];
const dimension = 3;
const linear = new Linear( positions, values, dimension );

linear.evaluate(  0 );
linear.evaluate( .5 ); 
linear.evaluate(  1 );

const positions = [ 0,0, 1,1, 2,2, 3,3 ];
const values = [ 
	0,0,0, 255,0,0, 0,255,0, 0,0,255,
	255,0,0, 0,255,0, 0,0,255, 0,0,0, 
	0,255,0, 0,0,255, 0,0,0, 255,0,0,
	0,0,255, 0,0,0, 255,0,0, 0,255,0
];
const dimension = 3;
const bicubic = new Bicubic( positions, values, dimension );

bicubic.step( [0,0], [1,1], [.1,.1] ( position, value ) => {
	// Do something with positions and the values.
});

Building and Testing

Setup

Running the build and testing procedures is easy. First make sure you have npm installed. Secondly navigate to the root directory / in your CLI and run npm install --save-dev which will install two dependencies required in the build and testing phases, esbuild and vitest respectively.

Building

To run the build procedure, you simply navigate to the root directory / in your CLI and run npm run build which will produce two files in the /build/ directory: Numfit.js and Numfit.min.js.

Testing

To run the tests, you again navigate to the root directory / in your CLI and run npm run test which will produce the test results.

Roadmap

Features that we are planning to support down the road are:

[ ] More types of samplers. Currently supports step, segment and map.
[ ] Polynomial
[ ] Multilinear
[ ] Multiquadratic
[ ] Multicubic
[ ] Multipolynomial
[ ] Linear Regression
[ ] Support for hermite interpolation (defining derivatives)
[ ] Support for Inverse Distance Weighing