<!--

@license Apache-2.0

Copyright (c) 2018 The Stdlib Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

-->

# isColumnMajorContiguous

> Determine if an array is column-major contiguous.

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

An array is **contiguous** if the memory address of each array element is adjacent to the memory address of the next array element.

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="usage">

## Usage

```javascript
var isColumnMajorContiguous = require( '@stdlib/ndarray/base/assert/is-column-major-contiguous' );
```

#### isColumnMajorContiguous( shape, strides, offset )

Returns a `boolean` indicating if an array is column-major contiguous.

```javascript
var shape = [ 2, 2 ];
var strides = [ 1, 2 ];
var offset = 25;

var bool = isColumnMajorContiguous( shape, strides, offset );
// returns true

shape = [ 10 ];
strides = [ 3 ]; // every third memory element
offset = 0;

bool = isColumnMajorContiguous( shape, strides, offset );
// returns false
```

</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">

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
var strides2offset = require( '@stdlib/ndarray/base/strides2offset' );
var randu = require( '@stdlib/random/base/randu' );
var isColumnMajorContiguous = require( '@stdlib/ndarray/base/assert/is-column-major-contiguous' );

var strides;
var offset;
var shape;
var bool;
var i;
var j;

shape = [ 0, 0, 0 ];

for ( i = 0; i < 100; i++ ) {
    // Generate a random array shape:
    shape[ 0 ] = discreteUniform( 1, 10 );
    shape[ 1 ] = discreteUniform( 1, 10 );
    shape[ 2 ] = discreteUniform( 1, 10 );

    // Generate 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;

    strides[ 0 ] *= discreteUniform( 1, 2 ); // if scaled by 1, then single segment

    // Compute the index offset:
    offset = strides2offset( shape, strides ) + 25; // include a view offset

    // Determine if the array is column-major contiguous:
    bool = isColumnMajorContiguous( shape, strides, offset );
    console.log( 'Shape: %s. Strides: %s. Offset: %d. Contiguous: %s.', shape.join( 'x' ), strides.join( ',' ), offset, bool );
}
```

</section>

<!-- /.examples -->

<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="references">

</section>

<!-- /.references -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="links">

</section>

<!-- /.links -->
