Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 130x 130x 130x 130x 130x 130x 130x 11x 130x 119x 80x 119x 57x 57x 19x 9x 9x 10x 57x 38x 38x 119x 62x 62x 29x 29x 62x 28x 28x 9x 9x 28x 12x 9x 9x 3x 28x 7x 7x 62x 5x 5x 62x 130x 23x 130x 15x 15x 38x 38x 38x 130x 13x 13x 13x 13x 13x 13x 13x 130x 25x 25x 25x 25x 25x 25x 25x 25x 25x 38x 38x 38x 38x 38x 38x 38x 38x 38x 4x 4x 38x 38x 38x 38x 38x 38x 38x 38x 2x 2x 38x 38x 38x 38x 38x 38x 38x 38x 2x 2x 38x 38x 38x 38x 38x 38x 38x 38x 2x 2x 38x 38x 38x 38x 38x 38x 38x 38x 7x 7x 38x 38x 38x 38x 38x 38x 38x 38x 38x 3x 3x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 2x 2x 2x 2x 2x 1x 1x 1x 1x 2x 2x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 1800x 1800x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 804x 804x 803x 804x 4x 4x 800x 804x 130x 2x 2x 2x 2x 2x | /**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var setReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' );
var setReadWriteAccessor = require( '@stdlib/utils/define-nonenumerable-read-write-accessor' );
var isPositive = require( '@stdlib/assert/is-positive-number' ).isPrimitive;
var isObject = require( '@stdlib/assert/is-plain-object' );
var isFunction = require( '@stdlib/assert/is-function' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var constantFunction = require( '@stdlib/utils/constant-function' );
var noop = require( '@stdlib/utils/noop' );
var randu = require( '@stdlib/random/base/mt19937' ).factory;
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var typedarray2json = require( '@stdlib/array/to-json' );
var format = require( '@stdlib/string/format' );
var rayleigh0 = require( './rayleigh.js' );
// MAIN //
/**
* Returns a pseudorandom number generator for generating Rayleigh distributed random numbers.
*
* @param {PositiveNumber} [sigma] - scale parameter
* @param {Options} [options] - function options
* @param {PRNG} [options.prng] - pseudorandom number generator which generates uniformly distributed pseudorandom numbers
* @param {PRNGSeedMT19937} [options.seed] - pseudorandom number generator seed
* @param {PRNGStateMT19937} [options.state] - pseudorandom number generator state
* @param {boolean} [options.copy=true] - boolean indicating whether to copy a provided pseudorandom number generator state
* @throws {TypeError} `sigma` must be a positive number
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @throws {Error} must provide a valid state
* @returns {PRNG} pseudorandom number generator
*
* @example
* var rayleigh = factory( 1.0 );
*
* var v = rayleigh();
* // returns <number>
*
* @example
* var rayleigh = factory( 0.5, {
* 'seed': 297
* });
* var v = rayleigh();
* // returns <number>
*
* @example
* var rayleigh = factory();
* var v = rayleigh( 0.5 );
* // returns <number>
*/
function factory() {
var sigma;
var opts;
var rand;
var prng;
if ( arguments.length === 0 ) {
rand = randu();
} else if (
arguments.length === 1 &&
isObject( arguments[ 0 ] )
) {
opts = arguments[ 0 ];
if ( hasOwnProp( opts, 'prng' ) ) {
if ( !isFunction( opts.prng ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be a pseudorandom number generator function. Option: `%s`.', 'prng', opts.prng ) );
}
rand = opts.prng;
} else {
rand = randu( opts );
}
} else {
sigma = arguments[ 0 ];
if ( !isPositive( sigma ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a positive number. Value: `%s`.', sigma ) );
}
if ( arguments.length > 1 ) {
opts = arguments[ 1 ];
if ( !isObject( opts ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', opts ) );
}
if ( hasOwnProp( opts, 'prng' ) ) {
if ( !isFunction( opts.prng ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be a pseudorandom number generator function. Option: `%s`.', 'prng', opts.prng ) );
}
rand = opts.prng;
} else {
rand = randu( opts );
}
} else {
rand = randu();
}
}
if ( sigma === void 0 ) {
prng = rayleigh2;
} else {
prng = rayleigh1;
}
setReadOnly( prng, 'NAME', 'rayleigh' );
// If we are provided an "external" PRNG, we don't support getting or setting PRNG state, as we'd need to check for compatible state value types, etc, entailing considerable complexity.
if ( opts && opts.prng ) {
setReadOnly( prng, 'seed', null );
setReadOnly( prng, 'seedLength', null );
setReadWriteAccessor( prng, 'state', constantFunction( null ), noop );
setReadOnly( prng, 'stateLength', null );
setReadOnly( prng, 'byteLength', null );
setReadOnly( prng, 'toJSON', constantFunction( null ) );
setReadOnly( prng, 'PRNG', rand );
} else {
setReadOnlyAccessor( prng, 'seed', getSeed );
setReadOnlyAccessor( prng, 'seedLength', getSeedLength );
setReadWriteAccessor( prng, 'state', getState, setState );
setReadOnlyAccessor( prng, 'stateLength', getStateLength );
setReadOnlyAccessor( prng, 'byteLength', getStateSize );
setReadOnly( prng, 'toJSON', toJSON );
setReadOnly( prng, 'PRNG', rand );
rand = rand.normalized;
}
return prng;
/**
* Returns the PRNG seed.
*
* @private
* @returns {PRNGSeedMT19937} seed
*/
function getSeed() {
return rand.seed;
}
/**
* Returns the PRNG seed length.
*
* @private
* @returns {PositiveInteger} seed length
*/
function getSeedLength() {
return rand.seedLength;
}
/**
* Returns the PRNG state length.
*
* @private
* @returns {PositiveInteger} state length
*/
function getStateLength() {
return rand.stateLength;
}
/**
* Returns the PRNG state size (in bytes).
*
* @private
* @returns {PositiveInteger} state size (in bytes)
*/
function getStateSize() {
return rand.byteLength;
}
/**
* Returns the current pseudorandom number generator state.
*
* @private
* @returns {PRNGStateMT19937} current state
*/
function getState() {
return rand.state;
}
/**
* Sets the pseudorandom number generator state.
*
* @private
* @param {PRNGStateMT19937} s - generator state
* @throws {Error} must provide a valid state
*/
function setState( s ) {
rand.state = s;
}
/**
* Serializes the pseudorandom number generator as a JSON object.
*
* ## Notes
*
* - `JSON.stringify()` implicitly calls this method when stringifying a PRNG.
*
* @private
* @returns {Object} JSON representation
*/
function toJSON() {
var out = {};
out.type = 'PRNG';
out.name = prng.NAME;
out.state = typedarray2json( rand.state );
if ( sigma === void 0 ) {
out.params = [];
} else {
out.params = [ sigma ];
}
return out;
}
/**
* Returns a pseudorandom number from a Rayleigh distribution with bound scale parameter `sigma`.
*
* @private
* @returns {NonNegativeNumber} pseudorandom number
*
* @example
* var v = rayleigh1();
* // returns <number>
*/
function rayleigh1() {
return rayleigh0( rand, sigma );
}
/**
* Returns a pseudorandom number from a Rayleigh distribution with scale parameter `sigma`.
*
* @private
* @param {PositiveNumber} sigma - scale parameter
* @returns {NonNegativeNumber} pseudorandom number
*
* @example
* var v = rayleigh2( 3.0 );
* // returns <number>
*/
function rayleigh2( sigma ) {
if (
isnan( sigma ) ||
sigma <= 0.0
) {
return NaN;
}
return rayleigh0( rand, sigma );
}
}
// EXPORTS //
module.exports = factory;
|