refactor: modify C implementation to accept double values

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Author: gunjjoshi

lib/node_modules/@stdlib/math/base/special/binomcoefln/README.md

@@ -187,17 +187,17 @@ logEachMap( 'ln( %d choose %d ) = %0.4f', n, k, binomcoefln );
 Evaluates the natural logarithm of the [binomial coefficient][binomial-coefficient] of two integers `n` and `k`.
 
 ```c
-double v = stdlib_base_binomcoefln( 8, 2 );
+double v = stdlib_base_binomcoefln( 8.0, 2.0 );
 // returns ~3.332
 ```
 
 The function accepts the following arguments:
 
--   **n**: `[in] int64_t` input value.
--   **k**: `[in] int64_t` input value.
+-   **n**: `[in] double` input value.
+-   **k**: `[in] double` input value.
 
 ```c
-double stdlib_base_binomcoefln( const int64_t n, const int64_t k );
+double stdlib_base_binomcoefln( const double n, const double k );
 ```
 
 </section>
@@ -221,18 +221,16 @@ double stdlib_base_binomcoefln( const int64_t n, const int64_t k );
 ```c
 #include "stdlib/math/base/special/binomcoefln.h"
 #include <stdio.h>
-#include <stdint.h>
-#include <inttypes.h>
 
 int main( void ) {
-    const int64_t a[] = { 24, 32, 48, 116, 33 };
-    const int64_t b[] = { 12, 6, 15, 52, 22 };
+    const double a[] = { 24.0, 32.0, 48.0, 116.0, 33.0 };
+    const double b[] = { 12.0, 6.0, 15.0, 52.0, 22.0 };
 
     double out;
     int i;
     for ( i = 0; i < 5; i++ ) {
         out = stdlib_base_binomcoefln( a[ i ], b[ i ] );
-        printf( "binomcoefln(%" PRId64 ", %" PRId64 ") = %lf\n", a[ i ], b[ i ], out );
+        printf( "binomcoefln(%lf, %lf) = %lf\n", a[ i ], b[ i ], out );
     }
 }
 ```

lib/node_modules/@stdlib/math/base/special/binomcoefln/benchmark/c/native/benchmark.c

@@ -90,16 +90,16 @@ static double rand_double( void ) {
 * @return elapsed time in seconds
 */
 static double benchmark( void ) {
-	int64_t n[ 100 ];
-	int64_t k[ 100 ];
+	double n[ 100 ];
+	double k[ 100 ];
 	double elapsed;
 	double y;
 	double t;
 	int i;
 
 	for ( i = 0; i < 100; i++ ) {
-		n[ i ] = (int64_t)round( 500.0 * rand_double() );
-		k[ i ] = (int64_t)round( 500.0 * rand_double() );
+		n[ i ] = round( 500.0 * rand_double() );
+		k[ i ] = round( 500.0 * rand_double() );
 	}
 
 	t = tic();

lib/node_modules/@stdlib/math/base/special/binomcoefln/examples/c/example.c

@@ -18,17 +18,15 @@
 
 #include "stdlib/math/base/special/binomcoefln.h"
 #include <stdio.h>
-#include <stdint.h>
-#include <inttypes.h>
 
 int main( void ) {
-	const int64_t a[] = { 24, 32, 48, 116, 33 };
-	const int64_t b[] = { 12, 6, 15, 52, 22 };
+	const double a[] = { 24.0, 32.0, 48.0, 116.0, 33.0 };
+	const double b[] = { 12.0, 6.0, 15.0, 52.0, 22.0 };
 
 	double out;
 	int i;
 	for ( i = 0; i < 5; i++ ) {
 		out = stdlib_base_binomcoefln( a[ i ], b[ i ] );
-		printf( "binomcoefln(%" PRId64 ", %" PRId64 ") = %lf\n", a[ i ], b[ i ], out );
+		printf( "binomcoefln(%lf, %lf) = %lf\n", a[ i ], b[ i ], out );
 	}
 }

lib/node_modules/@stdlib/math/base/special/binomcoefln/include/stdlib/math/base/special/binomcoefln.h

@@ -19,8 +19,6 @@
 #ifndef STDLIB_MATH_BASE_SPECIAL_BINOMCOEFLN_H
 #define STDLIB_MATH_BASE_SPECIAL_BINOMCOEFLN_H
 
-#include <stdint.h>
-
 /*
 * If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.
 */
@@ -31,7 +29,7 @@ extern "C" {
 /**
 * Computes the natural logarithm of the binomial coefficient of two integers.
 */
-double stdlib_base_binomcoefln( const int64_t n, const int64_t k );
+double stdlib_base_binomcoefln( const double n, const double k );
 
 #ifdef __cplusplus
 }

lib/node_modules/@stdlib/math/base/special/binomcoefln/manifest.json

@@ -42,7 +42,8 @@
         "@stdlib/math/base/special/betaln",
         "@stdlib/math/base/special/abs",
         "@stdlib/math/base/special/ln",
-        "@stdlib/constants/float64/ninf"
+        "@stdlib/constants/float64/ninf",
+        "@stdlib/math/base/assert/is-integer"
       ]
     },
     {
@@ -61,7 +62,8 @@
         "@stdlib/math/base/special/betaln",
         "@stdlib/math/base/special/abs",
         "@stdlib/math/base/special/ln",
-        "@stdlib/constants/float64/ninf"
+        "@stdlib/constants/float64/ninf",
+        "@stdlib/math/base/assert/is-integer"
       ]
     },
     {
@@ -80,7 +82,8 @@
         "@stdlib/math/base/special/betaln",
         "@stdlib/math/base/special/abs",
         "@stdlib/math/base/special/ln",
-        "@stdlib/constants/float64/ninf"
+        "@stdlib/constants/float64/ninf",
+        "@stdlib/math/base/assert/is-integer"
       ]
     }
   ]

lib/node_modules/@stdlib/math/base/special/binomcoefln/src/addon.c

@@ -19,4 +19,4 @@
 #include "stdlib/math/base/special/binomcoefln.h"
 #include "stdlib/math/base/napi/binary.h"
 
-STDLIB_MATH_BASE_NAPI_MODULE_LL_D( stdlib_base_binomcoefln )
+STDLIB_MATH_BASE_NAPI_MODULE_DD_D( stdlib_base_binomcoefln )

lib/node_modules/@stdlib/math/base/special/binomcoefln/src/main.c

@@ -17,6 +17,7 @@
 */
 
 #include "stdlib/math/base/special/binomcoefln.h"
+#include "stdlib/math/base/assert/is_integer.h"
 #include "stdlib/math/base/special/betaln.h"
 #include "stdlib/math/base/special/abs.h"
 #include "stdlib/math/base/special/ln.h"
@@ -31,10 +32,13 @@
 * @return     function value
 *
 * @example
-* double out = stdlib_base_binomcoefln( 8, 2 );
+* double out = stdlib_base_binomcoefln( 8.0, 2.0 );
 * // returns ~3.332
 */
-double stdlib_base_binomcoefln( const int64_t n, const int64_t k ) {
+double stdlib_base_binomcoefln( const double n, const double k ) {
+	if ( !stdlib_base_is_integer( n ) || !stdlib_base_is_integer( k ) ) {
+		return 0.0 / 0.0; // NaN
+	}
 	if ( n < 0 ) {
 		return stdlib_base_binomcoefln( -n + k - 1, k );
 	}
@@ -45,7 +49,7 @@ double stdlib_base_binomcoefln( const int64_t n, const int64_t k ) {
 		return 0.0;
 	}
 	if ( k == 1 ) {
-		return stdlib_base_ln( stdlib_base_abs( (double)n ) );
+		return stdlib_base_ln( stdlib_base_abs( n ) );
 	}
 	if ( n < k ) {
 		return STDLIB_CONSTANT_FLOAT64_NINF;
@@ -55,5 +59,5 @@ double stdlib_base_binomcoefln( const int64_t n, const int64_t k ) {
 	}
 
 	// Case: n - k >= 2
-	return -stdlib_base_ln( (double)(n + 1) ) - stdlib_base_betaln( (double)(n - k + 1), (double)(k + 1) );
+	return -stdlib_base_ln( ( n + 1 ) ) - stdlib_base_betaln( ( n - k + 1 ), ( k + 1 ) );
 }