chore: refactor random number generation in stats/base/dists/rayleigh

PR-URL: #5104
Closes: #4985

Co-authored-by: Philipp Burckhardt <pburckhardt@outlook.com>
Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>
Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>
Signed-off-by: ekambains <bainsinbusiness@gmail.com>

Author: ekambains

lib/node_modules/@stdlib/stats/base/dists/rayleigh/cdf/benchmark/benchmark.js

@@ -22,7 +22,7 @@
 
 var bench = require( '@stdlib/bench' );
 var Float64Array = require( '@stdlib/array/float64' );
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var pkg = require( './../package.json' ).name;
@@ -42,8 +42,8 @@ bench( pkg, function benchmark( b ) {
 	x = new Float64Array( len );
 	sigma = new Float64Array( len );
 	for ( i = 0; i < len; i++ ) {
-		x[ i ] = ( randu() * 100.0 ) - 100.0;
-		sigma[ i ] = ( randu() * 20.0 ) + EPS;
+		x[ i ] = uniform( -100.0, 100.0 );
+		sigma[ i ] = uniform( EPS, 20.0 );
 	}
 
 	b.tic();
@@ -64,17 +64,22 @@ bench( pkg, function benchmark( b ) {
 bench( pkg+':factory', function benchmark( b ) {
 	var sigma;
 	var mycdf;
+	var len;
 	var x;
 	var y;
 	var i;
 
 	sigma = 4.0;
 	mycdf = cdf.factory( sigma );
+	len = 100;
+	x = new Float64Array( len );
+	for ( i = 0; i < len; i++ ) {
+		x[ i ] = uniform( -25.0, 25.0 );
+	}
 
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		x = ( randu()*50.0 ) - 25.0;
-		y = mycdf( x );
+		y = mycdf( x[ i % len ] );
 		if ( isnan( y ) ) {
 			b.fail( 'should not return NaN' );
 		}