feat: add accessor arrays support to blas/ext/base/gsum

lib/node_modules/@stdlib/blas/ext/base/gsum/README.md

@@ -109,6 +109,7 @@ var v = gsum.ndarray( 4, x, 2, 1 );
 ## Notes
 
 -   If `N <= 0`, both functions return `0.0`.
+-   Both functions support array-like objects having getter and setter accessors for array element access (e.g., [`@stdlib/array/base/accessor`][@stdlib/array/base/accessor])
 -   Depending on the environment, the typed versions ([`dsum`][@stdlib/blas/ext/base/dsum], [`ssum`][@stdlib/blas/ext/base/ssum], etc.) are likely to be significantly more performant.
 
 </section>
@@ -167,6 +168,8 @@ console.log( v );
 
 [mdn-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
 
+[@stdlib/array/base/accessor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/accessor
+
 [mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
 
 <!-- <related-links> -->

lib/node_modules/@stdlib/blas/ext/base/gsum/docs/types/index.d.ts

@@ -20,7 +20,12 @@
 
 /// <reference types="@stdlib/types"/>
 
-import { NumericArray } from '@stdlib/types/array';
+import { NumericArray, Collection, AccessorArrayLike } from '@stdlib/types/array';
+
+/**
+* Input array.
+*/
+type InputArray = NumericArray | Collection<number> | AccessorArrayLike<number>;
 
 /**
 * Interface describing `gsum`.
@@ -40,7 +45,7 @@ interface Routine {
 	* var v = gsum( x.length, x, 1 );
 	* // returns 1.0
 	*/
-	( N: number, x: NumericArray, strideX: number ): number;
+	( N: number, x: InputArray, strideX: number ): number;
 
 	/**
 	* Computes the sum of strided array elements using alternative indexing semantics.
@@ -57,7 +62,7 @@ interface Routine {
 	* var v = gsum.ndarray( x.length, x, 1, 0 );
 	* // returns 1.0
 	*/
-	ndarray( N: number, x: NumericArray, strideX: number, offsetX: number ): number;
+	ndarray( N: number, x: InputArray, strideX: number, offsetX: number ): number;
 }
 
 /**

lib/node_modules/@stdlib/blas/ext/base/gsum/docs/types/test.ts

@@ -16,6 +16,7 @@
 * limitations under the License.
 */
 
+import AccessorArray = require( '@stdlib/array/base/accessor' );
 import gsum = require( './index' );
 
 
@@ -26,6 +27,7 @@ import gsum = require( './index' );
 	const x = new Float64Array( 10 );
 
 	gsum( x.length, x, 1 ); // $ExpectType number
+	gsum( x.length, new AccessorArray( x ), 1 );  // $ExpectType number
 }
 
 // The compiler throws an error if the function is provided a first argument which is not a number...
@@ -85,6 +87,7 @@ import gsum = require( './index' );
 	const x = new Float64Array( 10 );
 
 	gsum.ndarray( x.length, x, 1, 0 ); // $ExpectType number
+	gsum.ndarray( x.length, new AccessorArray( x ), 1, 0 );  // $ExpectType number
 }
 
 // The compiler throws an error if the `ndarray` method is provided a first argument which is not a number...

lib/node_modules/@stdlib/blas/ext/base/gsum/test/test.main.js

@@ -22,6 +22,7 @@
 
 var tape = require( 'tape' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
 var Float64Array = require( '@stdlib/array/float64' );
 var gsum = require( './../lib' );
 
@@ -66,6 +67,33 @@ tape( 'the function calculates the sum of all strided array elements', function
 	t.end();
 });
 
+tape( 'the function calculates the sum of all strided array elements (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0, 0.0, -3.0, 3.0 ];
+	v = gsum( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( v, 3.0, 'returns expected value' );
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0 ];
+	v = gsum( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( v, 3.0, 'returns expected value' );
+
+	x = [ -4.0, -4.0 ];
+	v = gsum( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( v, -8.0, 'returns expected value' );
+
+	x = [ NaN, 4.0 ];
+	v = gsum( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ 1.0, 1.0e100, 1.0, -1.0e100 ];
+	v = gsum( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( v, 2.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `0.0`', function test( t ) {
 	var x;
 	var v;
@@ -114,6 +142,27 @@ tape( 'the function supports a `stride` parameter', function test( t ) {
 	t.end();
 });
 
+tape( 'the function supports a `stride` parameter (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [
+		1.0,  // 0
+		2.0,
+		2.0,  // 1
+		-7.0,
+		-2.0, // 2
+		3.0,
+		4.0,  // 3
+		2.0
+	];
+
+	v = gsum( 4, toAccessorArray( x ), 2 );
+
+	t.strictEqual( v, 5.0, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function supports a negative `stride` parameter', function test( t ) {
 	var x;
 	var v;
@@ -135,6 +184,27 @@ tape( 'the function supports a negative `stride` parameter', function test( t )
 	t.end();
 });
 
+tape( 'the function supports a negative `stride` parameter (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [
+		1.0,  // 3
+		2.0,
+		2.0,  // 2
+		-7.0,
+		-2.0, // 1
+		3.0,
+		4.0,  // 0
+		2.0
+	];
+
+	v = gsum( 4, toAccessorArray( x ), -2 );
+
+	t.strictEqual( v, 5.0, 'returns expected value' );
+	t.end();
+});
+
 tape( 'if provided a `stride` parameter equal to `0`, the function returns the sum of the first element repeated N times', function test( t ) {
 	var x;
 	var v;
@@ -147,6 +217,18 @@ tape( 'if provided a `stride` parameter equal to `0`, the function returns the s
 	t.end();
 });
 
+tape( 'if provided a `stride` parameter equal to `0`, the function returns the sum of the first element repeated N times (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+
+	v = gsum( x.length, toAccessorArray( x ), 0 );
+	t.strictEqual( v, 5.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports view offsets', function test( t ) {
 	var x0;
 	var x1;

lib/node_modules/@stdlib/blas/ext/base/gsum/test/test.ndarray.js

@@ -22,6 +22,7 @@
 
 var tape = require( 'tape' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
 var gsum = require( './../lib/ndarray.js' );
 
 
@@ -65,6 +66,33 @@ tape( 'the function calculates the sum of all strided array elements', function
 	t.end();
 });
 
+tape( 'the function calculates the sum of all strided array elements', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0, 0.0, -3.0, 3.0 ];
+	v = gsum( x.length, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( v, 3.0, 'returns expected value' );
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0 ];
+	v = gsum( x.length, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( v, 3.0, 'returns expected value' );
+
+	x = [ -4.0, -4.0 ];
+	v = gsum( x.length, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( v, -8.0, 'returns expected value' );
+
+	x = [ NaN, 4.0 ];
+	v = gsum( x.length, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ 1.0, 1.0e100, 1.0, -1.0e100 ];
+	v = gsum( x.length, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( v, 2.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `0.0`', function test( t ) {
 	var x;
 	var v;
@@ -113,6 +141,27 @@ tape( 'the function supports a `stride` parameter', function test( t ) {
 	t.end();
 });
 
+tape( 'the function supports a `stride` parameter (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [
+		1.0,  // 0
+		2.0,
+		2.0,  // 1
+		-7.0,
+		-2.0, // 2
+		3.0,
+		4.0,  // 3
+		2.0
+	];
+
+	v = gsum( 4, toAccessorArray( x ), 2, 0 );
+
+	t.strictEqual( v, 5.0, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function supports a negative `stride` parameter', function test( t ) {
 	var x;
 	var v;
@@ -134,6 +183,27 @@ tape( 'the function supports a negative `stride` parameter', function test( t )
 	t.end();
 });
 
+tape( 'the function supports a negative `stride` parameter (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [
+		1.0,  // 3
+		2.0,
+		2.0,  // 2
+		-7.0,
+		-2.0, // 1
+		3.0,
+		4.0,  // 0
+		2.0
+	];
+
+	v = gsum( 4, toAccessorArray( x ), -2, 6 );
+
+	t.strictEqual( v, 5.0, 'returns expected value' );
+	t.end();
+});
+
 tape( 'if provided a `stride` parameter equal to `0`, the function returns the sum of the first element repeated N times', function test( t ) {
 	var x;
 	var v;
@@ -146,6 +216,18 @@ tape( 'if provided a `stride` parameter equal to `0`, the function returns the s
 	t.end();
 });
 
+tape( 'if provided a `stride` parameter equal to `0`, the function returns the sum of the first element repeated N times (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+
+	v = gsum( x.length, toAccessorArray( x ), 0, 0 );
+	t.strictEqual( v, 5.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports an `offset` parameter', function test( t ) {
 	var x;
 	var v;
@@ -166,3 +248,24 @@ tape( 'the function supports an `offset` parameter', function test( t ) {
 
 	t.end();
 });
+
+tape( 'the function supports an `offset` parameter (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [
+		2.0,
+		1.0,  // 0
+		2.0,
+		-2.0, // 1
+		-2.0,
+		2.0,  // 2
+		3.0,
+		4.0   // 3
+	];
+
+	v = gsum( 4, toAccessorArray( x ), 2, 1 );
+	t.strictEqual( v, 5.0, 'returns expected value' );
+
+	t.end();
+});