nditerInterleaveSubarrays

Create an iterator which iterates over interleaved subarrays.

Installation

npm install @stdlib/ndarray-iter-interleave-subarrays

Usage

var nditerInterleaveSubarrays = require( '@stdlib/ndarray-iter-interleave-subarrays' );

nditerInterleaveSubarrays( arr, ndims )

Returns an iterator which iterates over interleaved subarrays.

var array = require( '@stdlib/ndarray-array' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );

var x = array( [ [ [ 1, 2 ], [ 3, 4 ] ], [ [ 5, 6 ], [ 7, 8 ] ] ] );
// returns <ndarray>

var iter = nditerInterleaveSubarrays( [ x, x ], 2 );

var v = iter.next().value;
// returns <ndarray>

var arr = ndarray2array( v );
// returns [ [ 1, 2 ], [ 3, 4 ] ]

v = iter.next().value;
// returns <ndarray>

arr = ndarray2array( v );
// returns [ [ 1, 2 ], [ 3, 4 ] ]

// ...

The returned iterator protocol-compliant object has the following properties:

• next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
• return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.

Notes

• All provided ndarrays must be broadcast compatible.
• After broadcasting, each broadcasted input ndarray must have at least ndims+1 dimensions.
• For input ndarrays supporting read-only views, the function returns read-only views of interleaved subarrays. As input ndarrays may be broadcasted, a view is typically not contiguous. As more than one element of a returned view may refer to the same memory location, writing to a view may affect multiple elements. If you need to write to a subarray, copy the subarray before attempting mutation.
• If an environment supports Symbol.iterator, the returned iterator is iterable.
• A returned iterator does not copy a provided ndarray. To ensure iterable reproducibility, copy the input ndarray before creating an iterator. Otherwise, any changes to the contents of input ndarray will be reflected in the returned iterator.
• In environments supporting Symbol.iterator, the function explicitly does not invoke an ndarray's @@iterator method, regardless of whether this method is defined.

Examples

var array = require( '@stdlib/ndarray-array' );
var zeroTo = require( '@stdlib/array-base-zero-to' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var nditerInterleaveSubarrays = require( '@stdlib/ndarray-iter-interleave-subarrays' );

// Define input arrays:
var x = array( zeroTo( 27 ), {
    'shape': [ 3, 3, 3 ]
});
var y = array( zeroTo( 9 ), {
    'shape': [ 3, 3 ]
});

// Create an iterator for iterating over interleaved matrices:
var it = nditerInterleaveSubarrays( [ x, y ], 2 );

// Perform manual iteration...
var v;
while ( true ) {
    v = it.next();
    if ( v.done ) {
        break;
    }
    console.log( ndarray2array( v.value ) );
}

See Also

• @stdlib/ndarray-iter/subarrays: create an iterator which iterates over each subarray in a stack of subarrays.
• @stdlib/ndarray-slice: return a read-only view of an input ndarray.

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, 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 © 2016-2026. The Stdlib Authors.