fix: add missing docs and refactor

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---

Author: headlessNode

lib/node_modules/@stdlib/blas/base/gnrm2/README.md

@@ -123,6 +123,7 @@ var z = gnrm2.ndarray( 4, x, 2, 1 );
 
 -   If `N <= 0`, both functions return `0.0`.
 -   `gnrm2()` corresponds to the [BLAS][blas] level 1 function [`dnrm2`][dnrm2] with the exception that this implementation works with any array type, not just Float64Arrays. Depending on the environment, the typed versions ([`dnrm2`][@stdlib/blas/base/dnrm2], [`snrm2`][@stdlib/blas/base/snrm2], etc.) are likely to be significantly more performant.
+-   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]).
 
 </section>
 
@@ -181,6 +182,8 @@ console.log( out );
 
 [mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
 
+[@stdlib/array/base/accessor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/accessor
+
 [@stdlib/blas/base/dnrm2]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/blas/base/dnrm2
 
 [@stdlib/blas/base/snrm2]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/blas/base/snrm2

lib/node_modules/@stdlib/blas/base/gnrm2/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 `gnrm2`.
@@ -40,7 +45,7 @@ interface Routine {
 	* var z = gnrm2( x.length, x, 1 );
 	* // returns 3.0
 	*/
-	( N: number, x: NumericArray, stride: number ): number;
+	( N: number, x: InputArray, stride: number ): number;
 
 	/**
 	* Computes the L2-norm of a vector using alternative indexing semantics.
@@ -57,7 +62,7 @@ interface Routine {
 	* var z = gnrm2.ndarray( x.length, x, 1, 0 );
 	* // returns 3.0
 	*/
-	ndarray( N: number, x: NumericArray, stride: number, offset: number ): number;
+	ndarray( N: number, x: InputArray, stride: number, offset: number ): number;
 }
 
 /**

lib/node_modules/@stdlib/blas/base/gnrm2/docs/types/test.ts

@@ -16,6 +16,7 @@
 * limitations under the License.
 */
 
+import AccessorArray = require( '@stdlib/array/base/accessor' );
 import gnrm2 = require( './index' );
 
 
@@ -26,6 +27,7 @@ import gnrm2 = require( './index' );
 	const x = new Float64Array( 10 );
 
 	gnrm2( x.length, x, 1 ); // $ExpectType number
+	gnrm2( 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 gnrm2 = require( './index' );
 	const x = new Float64Array( 10 );
 
 	gnrm2.ndarray( x.length, x, 1, 0 ); // $ExpectType number
+	gnrm2.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/base/gnrm2/lib/accessors.js

@@ -49,28 +49,28 @@ var pow = require( '@stdlib/math/base/special/pow' );
 */
 function gnrm2( N, x, stride, offset ) {
 	var scale;
-	var xbuf;
-	var xget;
+	var buf;
+	var get;
 	var ssq;
 	var ax;
 	var ix;
 	var i;
 
-	xbuf = x.data;
-	xget = x.accessors[ 0 ];
+	buf = x.data;
+	get = x.accessors[ 0 ];
 
 	ix = offset;
 	if ( N === 1 ) {
-		return abs( xget( xbuf, ix ) );
+		return abs( get( buf, ix ) );
 	}
 	if ( stride === 0 ) {
-		return abs( N * xget( xbuf, ix ) );
+		return abs( N * get( buf, ix ) );
 	}
 	scale = 0.0;
 	ssq = 1.0;
 	for ( i = 0; i < N; i++ ) {
-		if ( xget( xbuf, ix ) !== 0.0 ) {
-			ax = abs( xget( xbuf, ix ) );
+		if ( get( buf, ix ) !== 0.0 ) {
+			ax = abs( get( buf, ix ) );
 			if ( scale < ax ) {
 				ssq = 1.0 + ( ssq * pow( scale/ax, 2 ) );
 				scale = ax;