refactor: update levy median implementation

Author: thedeeppp

lib/node_modules/@stdlib/stats/base/dists/levy/median/benchmark/benchmark.js

@@ -27,6 +27,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var pkg = require( './../package.json' ).name;
 var median = require( './../lib' );
+var uniform = require('@stdlib/random/base/uniform');
 
 
 // MAIN //
@@ -42,8 +43,8 @@ bench( pkg, function benchmark( b ) {
 	mu = new Float64Array( len );
 	c = new Float64Array( len );
 	for ( i = 0; i < len; i++ ) {
-		mu[ i ] = ( randu() * 100.0 ) - 50.0;
-		c[ i ] = ( randu() * 20.0 ) + EPS;
+		mu[ i ] = uniform( -50.0, 50.0 );
+		c[ i ] = uniform( EPS, 20.0 + EPS );
 	}
 
 	b.tic();

lib/node_modules/@stdlib/stats/base/dists/levy/median/benchmark/benchmark.native.js

@@ -28,6 +28,7 @@ var randu = require( '@stdlib/random/base/randu' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 var pkg = require( './../package.json' ).name;
+var uniform = require('@stdlib/random/base/uniform');
 
 
 // VARIABLES //
@@ -51,8 +52,8 @@ bench( pkg+'::native', opts, function benchmark( b ) {
 	mu = new Float64Array( len );
 	c = new Float64Array( len );
 	for ( i = 0; i < len; i++ ) {
-		mu[ i ] = ( randu() * 100.0 ) - 50.0;
-		c[ i ] = ( randu() * 20.0 ) + EPS;
+		mu[ i ] = uniform( -50.0, 50.0 );
+		c[ i ] = uniform( EPS, 20.0 + EPS );
 	}
 
 	b.tic();

lib/node_modules/@stdlib/stats/base/dists/levy/median/test/test.native.js

@@ -53,9 +53,9 @@ tape( 'main export is a function', opts, function test( t ) {
 
 tape( 'if provided `NaN` for any parameter, the function returns `NaN`', opts, function test( t ) {
 	var y = median( NaN, 1.0 );
-	t.equal( isnan( y ), true, 'returns NaN' );
+	t.equal( isnan( y ), true, 'returns expected value' );
 	y = median( 1.0, NaN );
-	t.equal( isnan( y ), true, 'returns NaN' );
+	t.equal( isnan( y ), true, 'returns expected value' );
 	t.end();
 });