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Singleton Dimensions

Return the number of singleton dimensions.

Installation

npm install @stdlib/ndarray-base-singleton-dimensions

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var singletonDimensions = require( '@stdlib/ndarray-base-singleton-dimensions' );

singletonDimensions( shape )

Returns the number of singleton dimensions.

var n = singletonDimensions( [ 3, 1, 3 ] );
// returns 1

Notes

• A singleton dimension is a dimension whose size is equal to 1.

Examples

var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var singletonDimensions = require( '@stdlib/ndarray-base-singleton-dimensions' );

var shape;
var n;
var i;

shape = [ 0, 0, 0 ];
for ( i = 0; i < 100; i++ ) {
    shape[ 0 ] = discreteUniform( 1, 5 );
    shape[ 1 ] = discreteUniform( 1, 5 );
    shape[ 2 ] = discreteUniform( 1, 5 );
    n = singletonDimensions( shape );
    console.log( 'shape: %s. singleton dimensions: %d.', shape.join( 'x' ), n );
}

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C APIs

Usage

#include "stdlib/ndarray/base/singleton_dimensions.h"

stdlib_ndarray_singleton_dimensions( ndims, *shape )

Returns the number of singleton dimensions.

int64_t ndims = 2;
int64_t shape[] = { 10, 1 };

int64_t n = stdlib_ndarray_singleton_dimensions( ndims, shape );
// returns 1

The function accepts the following arguments:

• ndims: [in] int64_t number of dimensions.
• shape: [in] int64_t* array shape.

int64_t stdlib_ndarray_singleton_dimensions( int64_t ndims, int64_t *shape );

Examples

#include "stdlib/ndarray/base/singleton_dimensions.h"
#include <stdio.h>
#include <inttypes.h>

int main( void ) {
    int64_t shape[] = { 10, 3, 1, 1, 5 };

    int64_t n = stdlib_ndarray_singleton_dimensions( 5, shape );
    printf( "shape: %"PRId64"x%"PRId64"x%"PRId64"x%"PRId64"x%"PRId64". singleton dimensions: %"PRId64"\n", shape[ 0 ], shape[ 1 ], shape[ 2 ], shape[ 3 ], shape[ 4 ], n );
}

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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

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.