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feat: add ndarray/base/offset 
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‎lib/node_modules/@stdlib/ndarray/base/offset/README.md‎

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<!--
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@license Apache-2.0
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Copyright (c) 2023 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# offset
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> Return the index offset specifying the underlying buffer index of the first iterated [ndarray][@stdlib/ndarray/base/ctor] element.
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- Package usage documentation. -->
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<section class="usage">
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## Usage
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```javascript
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var offset = require( '@stdlib/ndarray/base/offset' );
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```
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#### offset( x )
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Returns the index offset specifying the underlying buffer index of the first iterated [ndarray][@stdlib/ndarray/base/ctor] element.
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```javascript
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var zeros = require( '@stdlib/ndarray/zeros' );
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var x = zeros( [ 3, 2, 3 ] );
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// returns <ndarray>
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var n = offset( x );
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// returns 0
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```
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</section>
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<!-- /.usage -->
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<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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</section>
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<!-- /.notes -->
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<!-- Package usage examples. -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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<!-- eslint-disable new-cap -->
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```javascript
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var zeros = require( '@stdlib/ndarray/zeros' );
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var slice = require( '@stdlib/ndarray/slice' );
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var E = require( '@stdlib/slice/multi' );
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var S = require( '@stdlib/slice/ctor' );
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var offset = require( '@stdlib/ndarray/base/offset' );
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// Create an array:
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var x = zeros( [ 10, 10, 10, 10 ] );
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// returns <ndarray>
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// Define some slices:
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var slices = [
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// :,:,:,:
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E( null, null, null, null ),
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// 5:10,4,2:4,::-1
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E( S( 5, 10 ), 4, S( 2, 4 ), S( null, null, -1 ) ),
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// :,:,2,:
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E( null, null, 2, null ),
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// 1,2,3,:
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E( 1, 2, 3, null ),
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// 1,3,::2,4::2
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E( 1, 3, S( null, null, 2 ), S( 4, null, 2 ) )
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];
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// Determine the index offset for each slice...
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var s;
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var i;
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for ( i = 0; i < slices.length; i++ ) {
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s = slice( x, slices[ i ] );
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console.log( '%s => %d', s.shape.join( 'x' ), offset( s ) );
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}
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```
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</section>
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<!-- /.examples -->
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<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="references">
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</section>
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<!-- /.references -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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[@stdlib/ndarray/base/ctor]: https://github.com/stdlib-js/stdlib
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</section>
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<!-- /.links -->

‎lib/node_modules/@stdlib/ndarray/base/offset/benchmark/benchmark.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2023 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var bench = require( '@stdlib/bench' );
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var zeros = require( '@stdlib/array/base/zeros' );
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var ndarray = require( '@stdlib/ndarray/ctor' );
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var pkg = require( './../package.json' ).name;
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var offset = require( './../lib' );
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// MAIN //
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bench( pkg, function benchmark( b ) {
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var values;
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var buf;
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var n;
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var i;
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buf = zeros( 10000 );
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values = [
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ndarray( 'generic', buf, [ 10, 10, 10, 1 ], [ 1000, 100, 10, 1 ], 100, 'row-major' ),
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ndarray( 'generic', buf, [ 5, 5, 5, 1, 1 ], [ 125, 25, 5, 1, 1 ], 50, 'row-major' ),
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ndarray( 'generic', buf, [ 3, 4, 5 ], [ 20, 5, 1 ], 72, 'row-major' )
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];
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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n = offset( values[ i%values.length ] );
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if ( n !== n ) {
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b.fail( 'should not return NaN' );
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}
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}
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b.toc();
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if ( n !== n ) {
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b.fail( 'should not return NaN' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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});

‎lib/node_modules/@stdlib/ndarray/base/offset/docs/repl.txt‎

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{{alias}}( x )
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Returns the index offset specifying the underlying buffer index of the first
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iterated ndarray element.
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Parameters
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----------
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x: ndarray
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Input ndarray.
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Returns
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-------
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n: integer
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Index offset.
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Examples
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--------
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> var n = {{alias}}( {{alias:@stdlib/ndarray/zeros}}( [ 3, 3, 3 ] ) )
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0
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See Also
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--------
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‎lib/node_modules/@stdlib/ndarray/base/offset/docs/types/index.d.ts‎

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/*
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* @license Apache-2.0
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*
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* Copyright (c) 2023 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// TypeScript Version: 4.1
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/// <reference types="@stdlib/types"/>
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import { ndarray } from '@stdlib/types/ndarray';
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/**
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* Returns the index offset specifying the underlying buffer index of the first iterated ndarray element.
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*
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* @param x - input ndarray
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* @returns index offset
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*
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* @example
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* var zeros = require( `@stdlib/ndarray/zeros` );
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*
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* var n = offset( zeros( [ 3, 3, 3 ] ) );
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* // returns 0
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*/
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declare function offset( x: ndarray ): number;
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// EXPORTS //
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export = offset;

‎lib/node_modules/@stdlib/ndarray/base/offset/docs/types/test.ts‎

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/*
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* @license Apache-2.0
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*
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* Copyright (c) 2023 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import zeros = require( '@stdlib/ndarray/zeros' );
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import offset = require( './index' );
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// TESTS //
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// The function returns a number...
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{
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offset( zeros( [ 3, 2, 1 ] ) ); // $ExpectType number
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}
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// The compiler throws an error if the function is provided a value other than an ndarray...
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{
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offset( '5' ); // $ExpectError
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offset( 5 ); // $ExpectError
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offset( true ); // $ExpectError
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offset( false ); // $ExpectError
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offset( null ); // $ExpectError
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offset( undefined ); // $ExpectError
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offset( [ '1', '2' ] ); // $ExpectError
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offset( {} ); // $ExpectError
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offset( ( x: number ): number => x ); // $ExpectError
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}
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// The compiler throws an error if the function is provided an unsupported number of arguments...
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{
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offset(); // $ExpectError
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offset( zeros( [ 2, 2 ] ), {} ); // $ExpectError
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}

‎lib/node_modules/@stdlib/ndarray/base/offset/examples/index.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2023 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* eslint-disable new-cap */
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'use strict';
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var zeros = require( '@stdlib/ndarray/zeros' );
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var slice = require( '@stdlib/ndarray/slice' );
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var E = require( '@stdlib/slice/multi' );
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var S = require( '@stdlib/slice/ctor' );
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var offset = require( './../lib' );
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// Create an array:
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var x = zeros( [ 10, 10, 10, 10 ] );
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// returns <ndarray>
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// Define some slices:
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var slices = [
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// :,:,:,:
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E( null, null, null, null ),
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// 5:10,4,2:4,::-1
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E( S( 5, 10 ), 4, S( 2, 4 ), S( null, null, -1 ) ),
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// :,:,2,:
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E( null, null, 2, null ),
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// 1,2,3,:
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E( 1, 2, 3, null ),
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// 1,3,::2,4::2
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E( 1, 3, S( null, null, 2 ), S( 4, null, 2 ) )
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];
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// Determine the index offset for each slice...
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var s;
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var i;
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for ( i = 0; i < slices.length; i++ ) {
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s = slice( x, slices[ i ] );
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console.log( '%s => %d', s.shape.join( 'x' ), offset( s ) );
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}

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