feat(add c implementation): add stats/base/dists/erlang/mean

Author: vivekmaurya001

lib/node_modules/@stdlib/stats/base/dists/erlang/mean/benchmark/c/benchmark.c

@@ -95,22 +95,20 @@ static double random_uniform( const double min, const double max ) {
 */
 static double benchmark( void ) {
 	double elapsed;
-	double x[ 100 ];
-	double a[ 100 ];
-	double b[ 100 ];
+	double lambda[ 100 ];
+	double k[ 100 ];
 	double y;
 	double t;
 	int i;
 
 	for ( i = 0; i < 100; i++ ) {
-		x[ i ] = random_uniform( -10.0, 10.0 );
-		a[ i ] = random_uniform( -20.0, 0.0 );
-		b[ i ] = random_uniform( a[ i ], a[ i ]+40.0 );
+		lambda[ i ] = random_uniform( 0.0, 10.0 ) + STDLIB_CONSTANT_FLOAT64_EPS;
+		k[ i ] = stdlib_base_ceil(random_uniform( 0.0, 10.0 ));
 	}
 
 	t = tic();
 	for ( i = 0; i < ITERATIONS; i++ ) {
-		y = stdlib_base_dists_erlang_mean( x[ i%100 ], a[ i%100 ], b[ i%100 ] );
+		y = stdlib_base_dists_erlang_mean( k[ i%100 ], lambda[ i%100 ] );
 		if ( y != y ) {
 			printf( "should not return NaN\n" );
 			break;