npm package: @stdlib/ndarray-base-nonsingleton-dimensions
Description: Return the number of non-singleton dimensions.
Author: The Stdlib Authors
Latest version: 0.2.3

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# Non-Singleton Dimensions

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> Return the number of non-singleton dimensions.

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/ndarray-base-nonsingleton-dimensions
```

</section>

<section class="usage">

## Usage

```javascript
var nonsingletonDimensions = require( '@stdlib/ndarray-base-nonsingleton-dimensions' );
```

#### nonsingletonDimensions( shape )

Returns the number of non-singleton dimensions.

```javascript
var n = nonsingletonDimensions( [ 3, 1, 3 ] );
// returns 2
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   A singleton dimension is a dimension whose size is equal to `1`.

</section>

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<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var nonsingletonDimensions = require( '@stdlib/ndarray-base-nonsingleton-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 = nonsingletonDimensions( shape );
    console.log( 'shape: %s. non-singleton dimensions: %d.', shape.join( 'x' ), n );
}
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="usage">

### Usage

```c
#include "stdlib/ndarray/base/nonsingleton_dimensions.h"
```

#### stdlib_ndarray_nonsingleton_dimensions( ndims, \*shape )

Returns the number of non-singleton dimensions.

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

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

The function accepts the following arguments:

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

```c
int64_t stdlib_ndarray_nonsingleton_dimensions( int64_t ndims, int64_t *shape );
```

</section>

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<section class="notes">

</section>

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<section class="examples">

### Examples

```c
#include "stdlib/ndarray/base/nonsingleton_dimensions.h"
#include <stdio.h>
#include <inttypes.h>

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

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

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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* * *

## Notice

This package is part of [stdlib][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.

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## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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