Difference between revisions of "API:RNG::next"
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{{DISPLAYTITLE:RNG::next()}} | {{DISPLAYTITLE:RNG::next()}} | ||
| − | <tt>'''RNG::next()'''</tt> generates a | + | The <tt>'''RNG::next()'''</tt> method generates a random floating-point number in the range <tt>[0,1)</tt>. |
| − | + | === Usage === | |
''number'' = ''rng_object''.'''next'''(); | ''number'' = ''rng_object''.'''next'''(); | ||
__TOC__ | __TOC__ | ||
| − | == | + | == API Information == |
| − | / | + | === Description === |
| − | + | ||
| − | + | <tt>'''RNG::next()'''</tt> generates a pseudorandom floating-point number greater than or equal to 0 but less than 1 and returns the value generated. The number generated is entirely determined by the current state of the <tt>RNG</tt> instance before the call (see <tt>[[API:RNG::state|RNG::state]]</tt>). After calling this function, the state is advanced so a different value will be generated next time. Therefore if you save the RNG's state before calling <tt>RNG.next()</tt>, then restore it afterwards and call <tt>RNG.next()</tt> again, the same value will be returned. | |
| + | |||
| + | === Parameters === | ||
| + | |||
| + | This method has no parameters. | ||
| + | |||
| + | === Return Value === | ||
| + | |||
| + | A floating-point number in the range <tt>[0,1)</tt>. | ||
| + | |||
| + | == Examples == | ||
| + | |||
| + | === Shuffle an array === | ||
| + | |||
| + | let items = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] | ||
| − | |||
let rnGen = new RNG(); | let rnGen = new RNG(); | ||
| − | for (let i = | + | for (let i = items.length - 1; i > 0; --i) { |
| − | let j = Math.floor(rnGen.next() * (i + 1)); // | + | let j = Math.floor(rnGen.next() * (i + 1)); // discrete [0,i] |
| − | let orig_i = | + | let orig_i = items[i]; |
| − | + | items[i] = items[j]; | |
| − | + | items[j] = orig_i; | |
} | } | ||
| + | |||
| + | == See Also == | ||
| + | |||
| + | <tt> | ||
| + | * [[API:RNG::state|RNG::state]] | ||
| + | </tt> | ||
[[Category:Sphere 2 API]] | [[Category:Sphere 2 API]] | ||
Latest revision as of 03:53, 10 August 2017
The RNG::next() method generates a random floating-point number in the range [0,1).
Usage
number = rng_object.next();
Contents
API Information
Description
RNG::next() generates a pseudorandom floating-point number greater than or equal to 0 but less than 1 and returns the value generated. The number generated is entirely determined by the current state of the RNG instance before the call (see RNG::state). After calling this function, the state is advanced so a different value will be generated next time. Therefore if you save the RNG's state before calling RNG.next(), then restore it afterwards and call RNG.next() again, the same value will be returned.
Parameters
This method has no parameters.
Return Value
A floating-point number in the range [0,1).
Examples
Shuffle an array
let items = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
let rnGen = new RNG();
for (let i = items.length - 1; i > 0; --i) {
let j = Math.floor(rnGen.next() * (i + 1)); // discrete [0,i]
let orig_i = items[i];
items[i] = items[j];
items[j] = orig_i;
}
See Also
