From 26105034da4fcce7ac883c899d781f016559310d Mon Sep 17 00:00:00 2001 From: ruki Date: Thu, 8 Nov 2018 00:38:48 +0800 Subject: switch to vuepress --- node_modules/worker-farm/examples/pi/calc.js | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 node_modules/worker-farm/examples/pi/calc.js (limited to 'node_modules/worker-farm/examples/pi/calc.js') diff --git a/node_modules/worker-farm/examples/pi/calc.js b/node_modules/worker-farm/examples/pi/calc.js new file mode 100644 index 00000000..df9e5bae --- /dev/null +++ b/node_modules/worker-farm/examples/pi/calc.js @@ -0,0 +1,22 @@ +'use strict' + +/* A simple π estimation function using a Monte Carlo method + * For 0 to `points`, take 2 random numbers < 1, square and add them to + * find the area under that point in a 1x1 square. If that area is <= 1 + * then it's *within* a quarter-circle, otherwise it's outside. + * Take the number of points <= 1 and multiply it by 4 and you have an + * estimate! + * Do this across multiple processes and average the results to + * increase accuracy. + */ + +module.exports = function (points, callback) { + let inside = 0 + , i = points + + while (i--) + if (Math.pow(Math.random(), 2) + Math.pow(Math.random(), 2) <= 1) + inside++ + + callback(null, (inside / points) * 4) +} -- cgit v1.2.3