bench: update random value generation

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
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    status: na
  - task: lint_javascript_src
    status: na
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  - task: lint_c_src
    status: na
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    status: na
  - task: lint_c_benchmarks
    status: passed
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    status: na
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    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/kernel-log1p/benchmark/benchmark.js

@@ -21,8 +21,10 @@
 // MODULES //
 
 var bench = require( '@stdlib/bench' );
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/array/uniform' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var FLOAT64_SQRT_HALF = require( '@stdlib/constants/float64/sqrt-half' );
+var FLOAT64_SQRT_TWO = require( '@stdlib/constants/float64/sqrt-two' );
 var pkg = require( './../package.json' ).name;
 var kernelLog1p = require( './../lib' );
 
@@ -34,10 +36,11 @@ bench( pkg, function benchmark( b ) {
 	var y;
 	var i;
 
+	x = uniform( 100, FLOAT64_SQRT_HALF, FLOAT64_SQRT_TWO );
+
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		x = ( randu() + 1.0 ) * 0.7071067811865476;
-		y = kernelLog1p( x );
+		y = kernelLog1p( x[ i%x.length ] );
 		if ( isnan( y ) ) {
 			b.fail( 'should not return NaN' );
 		}

lib/node_modules/@stdlib/math/base/special/kernel-log1p/benchmark/benchmark.native.js

@@ -22,9 +22,11 @@
 
 var resolve = require( 'path' ).resolve;
 var bench = require( '@stdlib/bench' );
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/array/uniform' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var tryRequire = require( '@stdlib/utils/try-require' );
+var FLOAT64_SQRT_HALF = require( '@stdlib/constants/float64/sqrt-half' );
+var FLOAT64_SQRT_TWO = require( '@stdlib/constants/float64/sqrt-two' );
 var pkg = require( './../package.json' ).name;
 
 
@@ -43,10 +45,11 @@ bench( pkg+'::native', opts, function benchmark( b ) {
 	var y;
 	var i;
 
+	x = uniform( 100, FLOAT64_SQRT_HALF, FLOAT64_SQRT_TWO );
+
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		x = ( randu() + 1.0 ) * 0.7071067811865476;
-		y = kernelLog1p( x );
+		y = kernelLog1p( x[ i%x.length ] );
 		if ( isnan( y ) ) {
 			b.fail( 'should not return NaN' );
 		}

lib/node_modules/@stdlib/math/base/special/kernel-log1p/benchmark/c/native/benchmark.c

@@ -75,13 +75,15 @@ static double tic( void ) {
 }
 
 /**
-* Generates a random number on the interval [0,1).
+* Generates a random number on the interval [min,max).
 *
-* @return random number
+* @param min    minimum value (inclusive)
+* @param max    maximum value (exclusive)
+* @return       random number
 */
-static double rand_double( void ) {
-	int r = rand();
-	return (double)r / ( (double)RAND_MAX + 1.0 );
+static double random_uniform( const double min, const double max ) {
+	double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
+	return min + ( v*(max-min) );
 }
 
 /**
@@ -91,15 +93,18 @@ static double rand_double( void ) {
 */
 static double benchmark( void ) {
 	double elapsed;
-	double x;
+	double x[100];
 	double z;
 	double t;
 	int i;
 
+	for ( i = 0; i < 100; i++ ) {
+		x[ i ] = random_uniform( 0.7071067811865476, 1.4142135623730951 ); // ~[sqrt(2)/2, sqrt(2)]
+	}
+
 	t = tic();
 	for ( i = 0; i < ITERATIONS; i++ ) {
-		x = ( rand_double() + 1.0 ) * 0.7071067811865476;
-		z = stdlib_base_kernel_log1p( x );
+		z = stdlib_base_kernel_log1p( x[ i%100 ] );
 		if ( z != z ) {
 			printf( "should not return NaN\n" );
 			break;
@@ -124,7 +129,7 @@ int main( void ) {
 
 	print_version();
 	for ( i = 0; i < REPEATS; i++ ) {
-		printf( "# c::%s\n", NAME );
+		printf( "# c::native::%s\n", NAME );
 		elapsed = benchmark();
 		print_results( elapsed );
 		printf( "ok %d benchmark finished\n", i+1 );