Last active
March 4, 2016 18:20
-
-
Save efekarakus/3c30061ef9e56c2328c6 to your computer and use it in GitHub Desktop.
Ricker Wavelet
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| (function (global, factory) { | |
| typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) : | |
| typeof define === 'function' && define.amd ? define(['exports'], factory) : | |
| (factory((global.d3_peaks = global.d3_peaks || {}))); | |
| }(this, function (exports) { 'use strict'; | |
| /** | |
| * See https://en.wikipedia.org/wiki/Mexican_hat_wavelet | |
| */ | |
| function ricker() { | |
| var σ = 1; | |
| var ricker = function(t) { | |
| var t2 = t*t, | |
| variance = σ*σ; | |
| var C = 2.0 / ( Math.sqrt(3 * σ) * (Math.pow(Math.PI, 0.25)) ); | |
| var norm = (1.0 - (t2)/(variance)); | |
| var gauss = Math.exp( -(t2) / (2*variance) ); | |
| return C*norm*gauss; | |
| } | |
| ricker.std = function(_) { | |
| return arguments.length ? (σ = _, ricker) : σ; | |
| } | |
| return ricker; | |
| }; | |
| var version = "0.0.1"; | |
| exports.version = version; | |
| exports.ricker = ricker; | |
| })); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Ricker Wavelet</title> | |
| <style> | |
| path.wavelet { | |
| fill: none; | |
| stroke: black; | |
| stroke-width: 1.5px; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: black; | |
| shape-rendering: crispEdges; | |
| } | |
| .axis text { | |
| font-family: sans-serif; | |
| font-size: 11px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script src="d3-peaks.js" charset="utf-8"></script> | |
| <script> | |
| var data = d3.range(-10, 11); | |
| var width = 800, | |
| height = 470, | |
| margin = {top: 10, left: 30, bottom: 10, right: 10}; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| var g = svg.append("g") | |
| .datum(data) | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var ricker = d3_peaks.ricker(); | |
| ricker.std(1.5); | |
| var x = d3.scale.linear() | |
| .domain([-10, 10]) | |
| .range([20, width]); | |
| var y = d3.scale.linear() | |
| .domain([-.5, 1.0]) | |
| .range([height, 0]); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .tickValues(data); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left"); | |
| var line = d3.svg.line() | |
| .interpolate("cardinal") | |
| .x(function(d) { return x(d); }) | |
| .y(function(d) { return y(ricker(d)); }); | |
| g.append("g") | |
| .attr("class", "axis") | |
| .attr("transform", "translate(0," + y(0) + ")") | |
| .call(xAxis); | |
| g.append("g") | |
| .attr("class", "axis") | |
| .attr("transform", "translate(0,0)") | |
| .call(yAxis); | |
| g.append("path") | |
| .attr("d", line) | |
| .attr("class", "wavelet"); | |
| </script> | |
| </body> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment