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feat: add stats/strided/snanmskmidrange
PR-URL: #9821 Reviewed-by: Athan Reines <kgryte@gmail.com> Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com> Co-authored-by: Philipp Burckhardt <pburckhardt@outlook.com> Co-authored-by: Athan Reines <kgryte@gmail.com>
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‎lib/node_modules/@stdlib/stats/strided/snanmskmidrange/README.md‎

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<!--
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@license Apache-2.0
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Copyright (c) 2026 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<!-- lint disable maximum-heading-length -->
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# snanmskmidrange
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> Calculate the [mid-range][mid-range] of a single-precision floating-point strided array according to a mask, ignoring `NaN` values.
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<section class="intro">
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The [**mid-range**][mid-range], or **mid-extreme**, is the arithmetic mean of the maximum and minimum values in a data set.
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</section>
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<!-- /.intro -->
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<section class="usage">
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## Usage
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```javascript
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var snanmskmidrange = require( '@stdlib/stats/strided/snanmskmidrange' );
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```
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#### snanmskmidrange( N, x, strideX, mask, strideMask )
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Computes the [mid-range][mid-range] of a single-precision floating-point strided array according to a `mask`, ignoring `NaN` values.
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```javascript
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var Float32Array = require( '@stdlib/array/float32' );
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var Uint8Array = require( '@stdlib/array/uint8' );
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var x = new Float32Array( [ 1.0, -2.0, 4.0, 2.0, NaN ] );
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var mask = new Uint8Array( [ 0, 0, 1, 0, 0 ] );
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var v = snanmskmidrange( x.length, x, 1, mask, 1 );
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// returns 0.0
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```
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The function has the following parameters:
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- **N**: number of indexed elements.
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- **x**: input [`Float32Array`][@stdlib/array/float32].
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- **strideX**: stride length for `x`.
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- **mask**: mask [`Uint8Array`][@stdlib/array/uint8]. If a `mask` array element is `0`, the corresponding element in `x` is considered valid and **included** in computation. If a `mask` array element is `1`, the corresponding element in `x` is considered invalid/missing and **excluded** from computation.
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- **strideMask**: stride length for `mask`.
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The `N` and stride parameters determine which elements in the strided arrays are accessed at runtime. For example, to compute the [mid-range][mid-range] of every other element in `x`,
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```javascript
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var Float32Array = require( '@stdlib/array/float32' );
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var Uint8Array = require( '@stdlib/array/uint8' );
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var x = new Float32Array( [ 1.0, 2.0, -7.0, -2.0, 4.0, 3.0, 5.0, 6.0 ] );
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var mask = new Uint8Array( [ 0, 0, 0, 0, 0, 0, 1, 1 ] );
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var v = snanmskmidrange( 4, x, 2, mask, 2 );
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// returns -1.5
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```
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Note that indexing is relative to the first index. To introduce offsets, use [`typed array`][mdn-typed-array] views.
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<!-- eslint-disable stdlib/capitalized-comments -->
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```javascript
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var Float32Array = require( '@stdlib/array/float32' );
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var Uint8Array = require( '@stdlib/array/uint8' );
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var x0 = new Float32Array( [ 2.0, 1.0, -2.0, -2.0, 3.0, 4.0, 5.0, 6.0 ] );
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var x1 = new Float32Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
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var mask0 = new Uint8Array( [ 0, 0, 0, 0, 0, 0, 1, 1 ] );
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var mask1 = new Uint8Array( mask0.buffer, mask0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
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var v = snanmskmidrange( 4, x1, 2, mask1, 2 );
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// returns 1.0
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```
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#### snanmskmidrange.ndarray( N, x, strideX, offsetX, mask, strideMask, offsetMask )
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Computes the [mid-range][mid-range] of a single-precision floating-point strided array according to a `mask`, ignoring `NaN` values and using alternative indexing semantics.
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```javascript
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var Float32Array = require( '@stdlib/array/float32' );
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var Uint8Array = require( '@stdlib/array/uint8' );
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var x = new Float32Array( [ 1.0, -2.0, 4.0, 2.0, NaN ] );
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var mask = new Uint8Array( [ 0, 0, 1, 0, 0 ] );
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var v = snanmskmidrange.ndarray( x.length, x, 1, 0, mask, 1, 0 );
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// returns 0.0
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```
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The function has the following additional parameters:
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- **offsetX**: starting index for `x`.
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- **offsetMask**: starting index for `mask`.
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While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying buffer, offset parameters support indexing semantics based on starting indices. For example, to calculate the [mid-range][mid-range] for every other element in `x` starting from the second element
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```javascript
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var Float32Array = require( '@stdlib/array/float32' );
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var Uint8Array = require( '@stdlib/array/uint8' );
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var x = new Float32Array( [ 2.0, 1.0, -2.0, -2.0, 3.0, 4.0, 5.0, 6.0 ] );
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var mask = new Uint8Array( [ 0, 0, 0, 0, 0, 0, 1, 1 ] );
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var v = snanmskmidrange.ndarray( 4, x, 2, 1, mask, 2, 1 );
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// returns 1.0
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```
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- If `N <= 0`, both functions return `NaN`.
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</section>
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<!-- /.notes -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var uniform = require( '@stdlib/random/base/uniform' );
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var bernoulli = require( '@stdlib/random/base/bernoulli' );
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var filledarrayBy = require( '@stdlib/array/filled-by' );
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var snanmskmidrange = require( '@stdlib/stats/strided/snanmskmidrange' );
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function rand() {
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if ( bernoulli( 0.8 ) < 1 ) {
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return NaN;
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}
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return uniform( -50.0, 50.0 );
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}
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var x = filledarrayBy( 10, 'float32', rand );
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console.log( x );
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var mask = filledarrayBy( x.length, 'uint8', bernoulli.factory( 0.2 ) );
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console.log( mask );
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var v = snanmskmidrange( x.length, x, 1, mask, 1 );
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console.log( v );
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```
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</section>
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<!-- /.examples -->
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<!-- C interface documentation. -->
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* * *
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<section class="c">
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## C APIs
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- C usage documentation. -->
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<section class="usage">
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### Usage
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```c
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#include "stdlib/stats/strided/snanmskmidrange.h"
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```
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#### stdlib_strided_snanmskmidrange( N, \*X, strideX, \*Mask, strideMask )
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Computes the [mid-range][mid-range] of a single-precision floating-point strided array according to a `mask`, ignoring `NaN` values.
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```c
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#include <stdint.h>
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const float x[] = { 1.0f, -2.0f, 4.0f, 2.0f, 0.0f/0.0f };
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const uint8_t mask[] = { 0, 0, 1, 0, 0 };
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float v = stdlib_strided_snanmskmidrange( 5, x, 1, mask, 1 );
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// returns 0.0f
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```
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The function accepts the following arguments:
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- **N**: `[in] CBLAS_INT` number of indexed elements.
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- **X**: `[in] float*` input array.
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- **strideX**: `[in] CBLAS_INT` stride length for `X`.
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- **Mask**: `[in] uint8_t*` mask array. If a `Mask` array element is `0`, the corresponding element in `X` is considered valid and included in computation. If a `Mask` array element is `1`, the corresponding element in `X` is considered invalid/missing and excluded from computation.
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- **strideMask**: `[in] CBLAS_INT` stride length for `Mask`.
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```c
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float stdlib_strided_snanmskmidrange( const CBLAS_INT N, const float *X, const CBLAS_INT strideX, const uint8_t *Mask, const CBLAS_INT strideMask );
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```
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#### stdlib_strided_snanmskmidrange_ndarray( N, \*X, strideX, offsetX, \*Mask, strideMask, offsetMask )
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Computes the [mid-range][mid-range] of a single-precision floating-point strided array according to a `mask`, ignoring `NaN` values and using alternative indexing semantics.
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```c
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#include <stdint.h>
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const float x[] = { 1.0f, -2.0f, 4.0f, 2.0f, 0.0f/0.0f };
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const uint8_t mask[] = { 0, 0, 1, 0, 0 };
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float v = stdlib_strided_snanmskmidrange_ndarray( 5, x, 1, 0, mask, 1, 0 );
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// returns 0.0f
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```
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The function accepts the following arguments:
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- **N**: `[in] CBLAS_INT` number of indexed elements.
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- **X**: `[in] float*` input array.
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- **strideX**: `[in] CBLAS_INT` stride length for `X`.
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- **offsetX**: `[in] CBLAS_INT` starting index for `X`.
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- **Mask**: `[in] uint8_t*` mask array. If a `Mask` array element is `0`, the corresponding element in `X` is considered valid and included in computation. If a `Mask` array element is `1`, the corresponding element in `X` is considered invalid/missing and excluded from computation.
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- **strideMask**: `[in] CBLAS_INT` stride length for `Mask`.
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- **offsetMask**: `[in] CBLAS_INT` starting index for `Mask`.
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```c
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float stdlib_strided_snanmskmidrange_ndarray( const CBLAS_INT N, const float *X, const CBLAS_INT strideX, const CBLAS_INT offsetX, const uint8_t *Mask, const CBLAS_INT strideMask, const CBLAS_INT offsetMask );
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```
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</section>
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<!-- /.usage -->
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<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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</section>
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<!-- /.notes -->
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<!-- C API usage examples. -->
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<section class="examples">
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### Examples
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```c
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#include "stdlib/stats/strided/snanmskmidrange.h"
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#include <stdint.h>
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#include <stdio.h>
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int main( void ) {
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// Create a strided array:
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const float x[] = { 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 8.0f, 0.0f/0.0f, 0.0f/0.0f };
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// Create a mask array:
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const uint8_t mask[] = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1 };
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// Specify the number of elements:
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const int N = 5;
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// Specify the stride lengths:
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const int strideX = 2;
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const int strideMask = 2;
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// Compute the mid-range:
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float v = stdlib_strided_snanmskmidrange( N, x, strideX, mask, strideMask );
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// Print the result:
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printf( "mid-range: %f\n", v );
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}
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.c -->
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<section class="references">
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</section>
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<!-- /.references -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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[mid-range]: https://en.wikipedia.org/wiki/Mid-range
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[@stdlib/array/float32]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/float32
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[@stdlib/array/uint8]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/uint8
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[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
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</section>
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<!-- /.links -->

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