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offset

Return the index offset specifying the underlying buffer index of the first iterated ndarray element.

Usage

import offset from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-offset@deno/mod.js';

offset( x )

Returns the index offset specifying the underlying buffer index of the first iterated ndarray element.

import zeros from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-zeros@deno/mod.js';

var x = zeros( [ 3, 2, 3 ] );
// returns <ndarray>

var n = offset( x );
// returns 0

Examples

import zeros from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-zeros@deno/mod.js';
import slice from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-slice@deno/mod.js';
import E from 'https://cdn.jsdelivr.net/gh/stdlib-js/slice-multi@deno/mod.js';
import S from 'https://cdn.jsdelivr.net/gh/stdlib-js/slice-ctor@deno/mod.js';
import offset from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-offset@deno/mod.js';

// Create an array:
var x = zeros( [ 10, 10, 10, 10 ] );
// returns <ndarray>

// Define some slices:
var slices = [
    // :,:,:,:
    E( null, null, null, null ),

    // 5:10,4,2:4,::-1
    E( S( 5, 10 ), 4, S( 2, 4 ), S( null, null, -1 ) ),

    // :,:,2,:
    E( null, null, 2, null ),

    // 1,2,3,:
    E( 1, 2, 3, null ),

    // 1,3,::2,4::2
    E( 1, 3, S( null, null, 2 ), S( 4, null, 2 ) )
];

// Determine the index offset for each slice...
var s;
var i;
for ( i = 0; i < slices.length; i++ ) {
    s = slice( x, slices[ i ] );
    console.log( '%s => %d', s.shape.join( 'x' ), offset( s ) );
}

See Also

@stdlib/ndarray-array: multidimensional arrays.
@stdlib/ndarray-ctor: multidimensional array constructor.
@stdlib/ndarray-shape: return the shape of a provided ndarray.
@stdlib/ndarray-strides: return the strides of a provided ndarray.

Notice

This package is part of stdlib, a standard library with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.

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