2b:null 2c:["$","title",null,{"children":"Random Numbers | David Kirkby | Observable"}] 31:[] 2f:{"id":"31326f2dacb2ea88","slug":"pure-rand","title":"Random Numbers","thumbnail":"10b508191d7f7540707bc8fd8e90ce39f0accc5ade4e2ed41d96bec8b7cd2303","access_level":"public","create_time":"$D2026-09-08T22:02:50.063Z","update_time":"$D2026-09-08T22:21:52.022Z","view_time":null,"first_public_time":"$D2026-09-08T22:22:18.703Z","fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"82762c8496f321fe","login":"dkirkby","name":"David Kirkby","avatar_url":"https://avatars-next.observableusercontent.com/5b2c32ac920111620eb8369d40c1cd0353430f60391a4e246bc9822ab20f6f2f","tier":"starter_2024"},"version":31,"publish_version":31,"role":null,"authored":false,"authors":[{"type":"individual","id":"b31e222c78b643d7","login":"dkirkby","name":"David Kirkby","avatar_url":"https://avatars-next.observableusercontent.com/5b2c32ac920111620eb8369d40c1cd0353430f60391a4e246bc9822ab20f6f2f","tier":null}],"members":[{"type":"team","id":"82762c8496f321fe","login":"dkirkby","name":"David Kirkby","avatar_url":"https://avatars-next.observableusercontent.com/5b2c32ac920111620eb8369d40c1cd0353430f60391a4e246bc9822ab20f6f2f","tier":"starter_2024","role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"Random Numbers","cells":[{"id":1,"value":"# Random Numbers\n\nInterface to the [pure-rand](https://github.com/dubzzz/pure-rand) library with implementations of `getUniformFloat32` and `getNormalFloat32`.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2,"value":"import {xoroshiro128plus} from \"npm:pure-rand@8.4.2/generator/xoroshiro128plus\";\nimport {uniformInt} from \"npm:pure-rand@8.4.2/distribution/uniformInt\";\nimport {purify} from \"npm:pure-rand@8.4.2/utils/purify\";","pinned":true,"hidden":false,"mode":"js","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":3,"value":"function getUniformFloat32(seed, n, { channel=0, type=Float32Array}={}) {\n var rng = xoroshiro128plus(seed);\n if(channel > 0) {\n const pureJump = purify((rng) => rng.jump());\n for(let i=0; i 0) {\n const pureJump = purify((rng) => rng.jump());\n for(let i=0; i= 1 || s === 0);\n let mul = Math.sqrt(-2.0 * Math.log(s) / s);\n out[next++] = u * mul;\n if(next < n) out[next++] = v * mul;\n } while(next < n);\n return out;\n}","pinned":true,"hidden":false,"mode":"js","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":4,"value":"const test1 = display(getUniformFloat32(1, 4, { channel:2 }));","pinned":true,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"const test2 = display(getNormalFloat32(1, 4, { channel:3 }));","pinned":true,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W31","stdlib":"2","titling":"auto"}} 30:"$2f:body"