bench: move random number generation outside the benchmarking loops

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---

Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/cdf/benchmark/benchmark.js

@@ -22,8 +22,8 @@
 
 var bench = require( '@stdlib/bench' );
 var Float64Array = require( '@stdlib/array/float64' );
-var randu = require( '@stdlib/random/base/randu' );
-var round = require( '@stdlib/math/base/special/round' );
+var uniform = require( '@stdlib/random/base/uniform' );
+var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pkg = require( './../package.json' ).name;
 var cdf = require( './../lib' );
@@ -44,9 +44,9 @@ bench( pkg, function benchmark( b ) {
 	min = new Float64Array( len );
 	max = new Float64Array( len );
 	for ( i = 0; i < len; i++ ) {
-		x[ i ] = ( randu() * 20.0 ) - 10.0;
-		min[ i ] = round( randu()*10.0 );
-		max[ i ] = round( randu() * 10.0 ) + min[ i ];
+		x[ i ] = uniform( -10.0, 10.0 );
+		min[ i ] = discreteUniform( 0, 10 );
+		max[ i ] = discreteUniform( min[ i ], min[ i ] + 10 );
 	}
 
 	b.tic();
@@ -68,18 +68,23 @@ bench( pkg+':factory', function benchmark( b ) {
 	var mycdf;
 	var min;
 	var max;
+	var len;
 	var x;
 	var y;
 	var i;
 
 	min = -2;
 	max = 2;
 	mycdf = cdf.factory( min, max );
+	len = 100;
+	x = new Float64Array( len );
+	for ( i = 0; i < len; i++ ) {
+		x[ i ] = uniform( -2.0, 0.0 );
+	}
 
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		x = ( randu()*2.0 ) - 2.0;
-		y = mycdf( x );
+		y = mycdf( x[ i % len ] );
 		if ( isnan( y ) ) {
 			b.fail( 'should not return NaN' );
 		}

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/cdf/benchmark/benchmark.native.js

@@ -23,8 +23,8 @@
 var resolve = require( 'path' ).resolve;
 var bench = require( '@stdlib/bench' );
 var Float64Array = require( '@stdlib/array/float64' );
-var randu = require( '@stdlib/random/base/randu' );
-var round = require( '@stdlib/math/base/special/round' );
+var uniform = require( '@stdlib/random/base/uniform' );
+var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 var pkg = require( './../package.json' ).name;
@@ -53,9 +53,9 @@ bench( pkg+'::native', opts, function benchmark( b ) {
 	min = new Float64Array( len );
 	max = new Float64Array( len );
 	for ( i = 0; i < len; i++ ) {
-		x[ i ] = ( randu() * 20.0 ) - 10.0;
-		min[ i ] = round( randu()*10.0 );
-		max[ i ] = round( randu() * 10.0 ) + min[ i ];
+		x[ i ] = uniform( -10.0, 10.0 );
+		min[ i ] = discreteUniform( 0, 10 );
+		max[ i ] = discreteUniform( min[ i ], min[ i ] + 10 );
 	}
 
 	b.tic();