feat: add C implementation for stats/base/ndarray/smaxabs

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---

Author: Erennn7

lib/node_modules/@stdlib/stats/base/ndarray/smaxabs/README.md

@@ -95,6 +95,153 @@ console.log( v );
 
 <!-- /.examples -->
 
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/stats/base/ndarray/smaxabs.h"
+```
+
+#### stdlib_stats_smaxabs( arrays )
+
+Computes the maximum absolute value of a one-dimensional single-precision floating-point ndarray.
+
+```c
+#include "stdlib/ndarray/ctor.h"
+#include "stdlib/ndarray/dtypes.h"
+#include "stdlib/ndarray/index_modes.h"
+#include "stdlib/ndarray/orders.h"
+#include "stdlib/ndarray/base/bytes_per_element.h"
+#include <stdint.h>
+
+// Create an ndarray:
+const float data[] = { -1.0f, -2.0f, 3.0f, -4.0f };
+int64_t shape[] = { 4 };
+int64_t strides[] = { STDLIB_NDARRAY_FLOAT32_BYTES_PER_ELEMENT };
+int8_t submodes[] = { STDLIB_NDARRAY_INDEX_ERROR };
+
+struct ndarray *x = stdlib_ndarray_allocate( STDLIB_NDARRAY_FLOAT32, (uint8_t *)data, 1, shape, strides, 0, STDLIB_NDARRAY_ROW_MAJOR, STDLIB_NDARRAY_INDEX_ERROR, 1, submodes );
+
+// Compute the maximum absolute value:
+const struct ndarray *arrays[] = { x };
+float v = stdlib_stats_smaxabs( arrays );
+// returns 4.0f
+
+// Free allocated memory:
+stdlib_ndarray_free( x );
+```
+
+The function accepts the following arguments:
+
+-   **arrays**: `[in] struct ndarray**` list containing a one-dimensional input ndarray.
+
+```c
+float stdlib_stats_smaxabs( const struct ndarray *arrays[] );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/stats/base/ndarray/smaxabs.h"
+#include "stdlib/ndarray/ctor.h"
+#include "stdlib/ndarray/dtypes.h"
+#include "stdlib/ndarray/index_modes.h"
+#include "stdlib/ndarray/orders.h"
+#include "stdlib/ndarray/base/bytes_per_element.h"
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int main( void ) {
+   // Create a data buffer:
+   const float data[] = { -1.0f, -2.0f, 3.0f, -4.0f, 5.0f, -6.0f, 7.0f, -8.0f };
+
+   // Specify the number of array dimensions:
+   const int64_t ndims = 1;
+
+   // Specify the array shape:
+   int64_t shape[] = { 4 };
+
+   // Specify the array strides:
+   int64_t strides[] = { 2*STDLIB_NDARRAY_FLOAT32_BYTES_PER_ELEMENT };
+
+   // Specify the byte offset:
+   const int64_t offset = 0;
+
+   // Specify the array order:
+   const enum STDLIB_NDARRAY_ORDER order = STDLIB_NDARRAY_ROW_MAJOR;
+
+   // Specify the index mode:
+   const enum STDLIB_NDARRAY_INDEX_MODE imode = STDLIB_NDARRAY_INDEX_ERROR;
+
+   // Specify the subscript index modes:
+   int8_t submodes[] = { STDLIB_NDARRAY_INDEX_ERROR };
+   const int64_t nsubmodes = 1;
+
+   // Create an ndarray:
+   struct ndarray *x = stdlib_ndarray_allocate( STDLIB_NDARRAY_FLOAT32, (uint8_t *)data, ndims, shape, strides, offset, order, imode, nsubmodes, submodes );
+   if ( x == NULL ) {
+      fprintf( stderr, "Error allocating memory.\n" );
+      exit( 1 );
+   }
+
+   // Define a list of ndarrays:
+   const struct ndarray *arrays[] = { x };
+
+   // Compute the maximum absolute value:
+   float v = stdlib_stats_smaxabs( arrays );
+
+   // Print the result:
+   printf( "maxabs: %f\n", v );
+
+   // Free allocated memory:
+   stdlib_ndarray_free( x );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">

lib/node_modules/@stdlib/stats/base/ndarray/smaxabs/benchmark/benchmark.js

@@ -22,11 +22,12 @@
 
 var bench = require( '@stdlib/bench' );
 var uniform = require( '@stdlib/random/array/uniform' );
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
-var smaxabs = require( './../lib' );
+var smaxabs = require( './../lib/main.js' );
 
 
 // VARIABLES //
@@ -45,12 +46,12 @@ var options = {
 * @param {PositiveInteger} len - array length
 * @returns {Function} benchmark function
 */
-function createBenchmark( len ) {
+function createBenchmark(len) {
 	var xbuf;
 	var x;
 
-	xbuf = uniform( len, -10.0, 10.0, options );
-	x = new ndarray( options.dtype, xbuf, [ len ], [ 1 ], 0, 'row-major' );
+	xbuf = uniform(len, -10.0, 10.0, options);
+	x = new ndarray(options.dtype, xbuf, [len], [1], 0, 'row-major');
 
 	return benchmark;
 
@@ -60,22 +61,22 @@ function createBenchmark( len ) {
 	* @private
 	* @param {Benchmark} b - benchmark instance
 	*/
-	function benchmark( b ) {
+	function benchmark(b) {
 		var v;
 		var i;
 
 		b.tic();
-		for ( i = 0; i < b.iterations; i++ ) {
-			v = smaxabs( [ x ] );
-			if ( isnan( v ) ) {
-				b.fail( 'should not return NaN' );
+		for (i = 0; i < b.iterations; i++) {
+			v = smaxabs([x]);
+			if (isnanf(v)) {
+				b.fail('should not return NaN');
 			}
 		}
 		b.toc();
-		if ( isnan( v ) ) {
-			b.fail( 'should not return NaN' );
+		if (isnanf(v)) {
+			b.fail('should not return NaN');
 		}
-		b.pass( 'benchmark finished' );
+		b.pass('benchmark finished');
 		b.end();
 	}
 }
@@ -98,10 +99,10 @@ function main() {
 	min = 1; // 10^min
 	max = 6; // 10^max
 
-	for ( i = min; i <= max; i++ ) {
-		len = pow( 10, i );
-		f = createBenchmark( len );
-		bench( pkg+':len='+len, f );
+	for (i = min; i <= max; i++) {
+		len = pow(10, i);
+		f = createBenchmark(len);
+		bench(format('%s:len=%d', pkg, len), f);
 	}
 }
 

lib/node_modules/@stdlib/stats/base/ndarray/smaxabs/benchmark/benchmark.native.js

@@ -0,0 +1,114 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var resolve = require( 'path' ).resolve;
+var bench = require( '@stdlib/bench' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var format = require( '@stdlib/string/format' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var smaxabs = tryRequire(resolve(__dirname, './../lib/native.js'));
+var opts = {
+	'skip': (smaxabs instanceof Error)
+};
+var options = {
+	'dtype': 'float32'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark(len) {
+	var xbuf;
+	var x;
+
+	xbuf = uniform(len, -10.0, 10.0, options);
+	x = new ndarray(options.dtype, xbuf, [len], [1], 0, 'row-major');
+
+	return benchmark;
+
+	/**
+* Benchmark function.
+*
+* @private
+* @param {Benchmark} b - benchmark instance
+* */
+	function benchmark(b) {
+		var v;
+		var i;
+
+		b.tic();
+		for (i = 0; i < b.iterations; i++) {
+			v = smaxabs([x]);
+			if (isnanf(v)) {
+				b.fail('should not return NaN');
+			}
+		}
+		b.toc();
+		if (isnanf(v)) {
+			b.fail('should not return NaN');
+		}
+		b.pass('benchmark finished');
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for (i = min; i <= max; i++) {
+		len = pow(10, i);
+		f = createBenchmark(len);
+		bench(format('%s::native:len=%d', pkg, len), opts, f);
+	}
+}
+
+main();