# strides2order

Determine the order of a multidimensional array based on a provided stride array.

## Usage

``````var strides2order = require( '@stdlib/ndarray/base/strides2order' );
``````

#### strides2order( strides )

Determines the order of a multidimensional array based on a provided stride array.

``````var order = strides2order( [ 2, 1 ] );
// returns 'row-major'

order = strides2order( [ 1, 2 ] );
// returns 'column-major'

order = strides2order( [ 3 ] );
// returns 'both'

order = strides2order( [ 1, 3, 2 ] );
// returns 'none'

order = strides2order( [] );
// returns 'none'
``````

The function returns one of the following values:

• `'row-major'`: based on the stride array, the array is in row-major order.
• `'column-major'`: based on the stride array, the array is in column-major order.
• `'both'`: based on the stride array, the array is in both row-major and column-major order.
• `'none'`: based on the stride array, the array is in neither row-major nor column-major order.

## Examples

``````var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
var randu = require( '@stdlib/random/base/randu' );
var strides2order = require( '@stdlib/ndarray/base/strides2order' );

var strides;
var order;
var shape;
var i;
var j;

shape = new Array( 3 );

for ( i = 0; i < 20; i++ ) {
// Generate a random array shape:
shape[ 0 ] = discreteUniform( 1, 10 );
shape[ 1 ] = discreteUniform( 1, 10 );
shape[ 2 ] = discreteUniform( 1, 10 );

// Compute the strides:
if ( randu() < 0.5 ) {
strides = shape2strides( shape, 'row-major' );
} else {
strides = shape2strides( shape, 'column-major' );
}
j = discreteUniform( 0, shape.length-1 );
strides[ j ] *= ( randu() < 0.5 ) ? -1 : 1;

// Determine the order:
order = strides2order( strides );
console.log( 'Strides: %s. Order: %s.', strides.join( ',' ), order );
}
``````