@stdlib/stats/base/smaxsorted/README.md

Standard library statistical functions.

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# smaxsorted

> Calculate the maximum value of a sorted single-precision floating-point strided array.

<section class="intro">

</section>

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<section class="usage">

## Usage

```javascript
var smaxsorted = require( '@stdlib/stats/base/smaxsorted' );
```

#### smaxsorted( N, x, stride )

Computes the maximum value of a sorted single-precision floating-point strided array `x`.

```javascript
var Float32Array = require( '@stdlib/array/float32' );

var x = new Float32Array( [ 1.0, 2.0, 3.0 ] );
var N = x.length;

var v = smaxsorted( N, x, 1 );
// returns 3.0

x = new Float32Array( [ 3.0, 2.0, 1.0 ] );
N = x.length;

v = smaxsorted( N, x, 1 );
// returns 3.0
```

The function has the following parameters:

-   **N**: number of indexed elements.
-   **x**: sorted input [`Float32Array`][@stdlib/array/float32].
-   **stride**: index increment for `x`.

The `N` and `stride` parameters determine which elements in `x` are accessed at runtime. For example, to compute the maximum value of every other element in `x`,

```javascript
var Float32Array = require( '@stdlib/array/float32' );
var floor = require( '@stdlib/math/base/special/floor' );

var x = new Float32Array( [ 1.0, 2.0, 2.0, -7.0, 3.0, 3.0, 4.0, 2.0 ] );
var N = floor( x.length / 2 );

var v = smaxsorted( N, x, 2 );
// returns 4.0
```

Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][mdn-typed-array] views.

<!-- eslint-disable stdlib/capitalized-comments -->

```javascript
var Float32Array = require( '@stdlib/array/float32' );
var floor = require( '@stdlib/math/base/special/floor' );

var x0 = new Float32Array( [ 2.0, 1.0, 2.0, 2.0, -2.0, 2.0, 3.0, 4.0 ] );
var x1 = new Float32Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element

var N = floor( x0.length / 2 );

var v = smaxsorted( N, x1, 2 );
// returns 4.0
```

#### smaxsorted.ndarray( N, x, stride, offset )

Computes the maximum value of a sorted single-precision floating-point strided array using alternative indexing semantics.

```javascript
var Float32Array = require( '@stdlib/array/float32' );

var x = new Float32Array( [ 1.0, 2.0, 3.0 ] );
var N = x.length;

var v = smaxsorted.ndarray( N, x, 1, 0 );
// returns 3.0
```

The function has the following additional parameters:

-   **offset**: starting index for `x`.

While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying `buffer`, the `offset` parameter supports indexing semantics based on a starting index. For example, to calculate the maximum value for every other value in `x` starting from the second value

```javascript
var Float32Array = require( '@stdlib/array/float32' );
var floor = require( '@stdlib/math/base/special/floor' );

var x = new Float32Array( [ 2.0, 1.0, 2.0, 2.0, -2.0, 2.0, 3.0, 4.0 ] );
var N = floor( x.length / 2 );

var v = smaxsorted.ndarray( N, x, 2, 1 );
// returns 4.0
```

</section>

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<section class="notes">

## Notes

-   If `N <= 0`, both functions return `NaN`.
-   The input strided array must be sorted in either **strictly** ascending or descending order.

</section>

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<section class="examples">

## Examples

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

```javascript
var Float32Array = require( '@stdlib/array/float32' );
var smaxsorted = require( '@stdlib/stats/base/smaxsorted' );

var x;
var i;

x = new Float32Array( 10 );
for ( i = 0; i < x.length; i++ ) {
    x[ i ] = i - 5.0;
}
console.log( x );

var v = smaxsorted( x.length, x, 1 );
console.log( v );
```

</section>

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/stats/base/dmaxsorted`][@stdlib/stats/base/dmaxsorted]</span><span class="delimiter">: </span><span class="description">calculate the maximum value of a sorted double-precision floating-point strided array.</span>
-   <span class="package-name">[`@stdlib/stats/base/maxsorted`][@stdlib/stats/base/maxsorted]</span><span class="delimiter">: </span><span class="description">calculate the maximum value of a sorted strided array.</span>
-   <span class="package-name">[`@stdlib/stats/base/smax`][@stdlib/stats/base/smax]</span><span class="delimiter">: </span><span class="description">calculate the maximum value of a single-precision floating-point strided array.</span>
-   <span class="package-name">[`@stdlib/stats/base/sminsorted`][@stdlib/stats/base/sminsorted]</span><span class="delimiter">: </span><span class="description">calculate the minimum value of a sorted single-precision floating-point strided array.</span>

</section>

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<section class="links">

[@stdlib/array/float32]: https://www.npmjs.com/package/@stdlib/array-float32

[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray

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[@stdlib/stats/base/dmaxsorted]: https://github.com/stdlib-js/stats/tree/main/base/dmaxsorted

[@stdlib/stats/base/maxsorted]: https://github.com/stdlib-js/stats/tree/main/base/maxsorted

[@stdlib/stats/base/smax]: https://github.com/stdlib-js/stats/tree/main/base/smax

[@stdlib/stats/base/sminsorted]: https://github.com/stdlib-js/stats/tree/main/base/sminsorted

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</section>

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