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‎CHANGELOG.md‎

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### Features
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- [`c216b80`](https://github.com/stdlib-js/stdlib/commit/c216b80baf3efe0d21387a280368c44122328b76) - add `stats/base/ndarray/smskmidrange` [(#9519)](https://github.com/stdlib-js/stdlib/pull/9519)
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- [`d681872`](https://github.com/stdlib-js/stdlib/commit/d681872a9b87321f4f66852f5aabfeec19e195fc) - add `stats/base/ndarray/mskmidrange` [(#9511)](https://github.com/stdlib-js/stdlib/pull/9511)
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- [`c824fea`](https://github.com/stdlib-js/stdlib/commit/c824feae2f1582ff59f0d3bee99896fa77ef1f81) - add `stats/base/ndarray/snanmidrange` [(#9505)](https://github.com/stdlib-js/stdlib/pull/9505)
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- [`8107a5a`](https://github.com/stdlib-js/stdlib/commit/8107a5a755bbdeb69c8110a2dbc9ed1a39d136c9) - add `stats/base/ndarray/dnanmidrange` [(#9504)](https://github.com/stdlib-js/stdlib/pull/9504)
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<details>
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- [`c216b80`](https://github.com/stdlib-js/stdlib/commit/c216b80baf3efe0d21387a280368c44122328b76) - **feat:** add `stats/base/ndarray/smskmidrange` [(#9519)](https://github.com/stdlib-js/stdlib/pull/9519) _(by Sachin Pangal, Athan Reines)_
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- [`bda1a5c`](https://github.com/stdlib-js/stdlib/commit/bda1a5c6cfa6777839ab5f941296b2008880b75a) - **fix:** use correct types _(by Athan Reines)_
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- [`d681872`](https://github.com/stdlib-js/stdlib/commit/d681872a9b87321f4f66852f5aabfeec19e195fc) - **feat:** add `stats/base/ndarray/mskmidrange` [(#9511)](https://github.com/stdlib-js/stdlib/pull/9511) _(by Sachin Pangal)_
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- [`c824fea`](https://github.com/stdlib-js/stdlib/commit/c824feae2f1582ff59f0d3bee99896fa77ef1f81) - **feat:** add `stats/base/ndarray/snanmidrange` [(#9505)](https://github.com/stdlib-js/stdlib/pull/9505) _(by Sachin Pangal)_

‎base/ndarray/smskmidrange/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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# smskmidrange
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> Calculate the [mid-range][mid-range] of a one-dimensional single-precision floating-point ndarray according to a mask.
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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. The measure is the midpoint of the range and a measure of central tendency.
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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 smskmidrange = require( '@stdlib/stats/base/ndarray/smskmidrange' );
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```
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#### smskmidrange( arrays )
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Computes the [mid-range][mid-range] of a one-dimensional single-precision floating-point ndarray according to a mask.
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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 ndarray = require( '@stdlib/ndarray/base/ctor' );
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var xbuf = new Float32Array( [ 1.0, -2.0, 4.0, 2.0 ] );
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var x = new ndarray( 'float32', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
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var maskbuf = new Uint8Array( [ 0, 0, 1, 0 ] );
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var mask = new ndarray( 'uint8', maskbuf, [ 4 ], [ 1 ], 0, 'row-major' );
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var v = smskmidrange( [ x, mask ] );
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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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- **arrays**: array-like object containing an input ndarray and a mask ndarray.
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If a `mask` array element is `0`, the corresponding element in the input ndarray is considered valid and **included** in computation. If a `mask` array element is `1`, the corresponding element in the input ndarray is considered invalid/missing and **excluded** from computation.
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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 provided an empty ndarray or a mask with all elements set to `1`, the function returns `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/array/uniform' );
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var bernoulli = require( '@stdlib/random/array/bernoulli' );
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var ndarray = require( '@stdlib/ndarray/base/ctor' );
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var ndarray2array = require( '@stdlib/ndarray/to-array' );
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var smskmidrange = require( '@stdlib/stats/base/ndarray/smskmidrange' );
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var xbuf = uniform( 10, -50.0, 50.0, {
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'dtype': 'float32'
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});
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var x = new ndarray( 'float32', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
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console.log( ndarray2array( x ) );
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var maskbuf = bernoulli( xbuf.length, 0.2, {
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'dtype': 'uint8'
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});
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var mask = new ndarray( 'uint8', maskbuf, [ maskbuf.length ], [ 1 ], 0, 'row-major' );
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console.log( ndarray2array( mask ) );
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var v = smskmidrange( [ x, mask ] );
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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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<!-- 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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</section>
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<!-- /.links -->

‎base/ndarray/smskmidrange/benchmark/benchmark.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2026 The Stdlib Authors.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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'use strict';
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// MODULES //
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var bench = require( '@stdlib/bench' );
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var format = require( '@stdlib/string/format' );
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var uniform = require( '@stdlib/random/array/uniform' );
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var bernoulli = require( '@stdlib/random/array/bernoulli' );
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var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
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var pow = require( '@stdlib/math/base/special/pow' );
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var ndarray = require( '@stdlib/ndarray/base/ctor' );
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var pkg = require( './../package.json' ).name;
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var smskmidrange = require( './../lib' );
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// VARIABLES //
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var xoptions = {
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'dtype': 'float32'
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};
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var moptions = {
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'dtype': 'uint8'
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};
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// FUNCTIONS //
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/**
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* Creates a benchmark function.
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*
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* @private
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* @param {PositiveInteger} len - array length
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* @returns {Function} benchmark function
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*/
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function createBenchmark( len ) {
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var mask;
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var mbuf;
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var xbuf;
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var x;
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xbuf = uniform( len, -100.0, 100.0, xoptions );
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x = new ndarray( 'float32', xbuf, [ len ], [ 1 ], 0, 'row-major' );
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mbuf = bernoulli( len, 0.2, moptions );
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mask = new ndarray( 'uint8', mbuf, [ len ], [ 1 ], 0, 'row-major' );
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return benchmark;
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function benchmark( b ) {
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var v;
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var i;
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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xbuf[ i%len ] = i;
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v = smskmidrange( [ x, mask ] );
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if ( isnanf( v ) ) {
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b.fail( 'should not return NaN' );
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}
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}
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b.toc();
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if ( isnanf( v ) ) {
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b.fail( 'should not return NaN' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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}
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}
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// MAIN //
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/**
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* Main execution sequence.
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*
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* @private
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*/
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function main() {
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var len;
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var min;
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var max;
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var f;
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var i;
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min = 1; // 10^min
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max = 6; // 10^max
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for ( i = min; i <= max; i++ ) {
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len = pow( 10, i );
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f = createBenchmark( len );
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bench( format( '%s:len=%d', pkg, len ), f );
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}
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}
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main();

‎base/ndarray/smskmidrange/docs/repl.txt‎

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{{alias}}( arrays )
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Calculates the mid-range of a one-dimensional single-precision floating-
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point ndarray according to a mask.
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If provided an empty ndarray or a mask with all elements set to `1`, the
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function returns `NaN`.
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Parameters
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----------
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arrays: ArrayLikeObject<ndarray>
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Array-like object containing an input ndarray and a mask ndarray.
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Returns
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-------
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out: number
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Mid-range.
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Examples
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--------
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> var xbuf = new {{alias:@stdlib/array/float32}}( [ 1.0, -2.0, 4.0, 2.0 ] );
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> var dt = 'float32';
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> var sh = [ xbuf.length ];
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> var sx = [ 1 ];
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> var ox = 0;
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> var ord = 'row-major';
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> var x = new {{alias:@stdlib/ndarray/ctor}}( dt, xbuf, sh, sx, ox, ord );
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> var mbuf = new {{alias:@stdlib/array/uint8}}( [ 0, 0, 1, 0 ] );
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> var mdt = 'uint8';
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> var mask = new {{alias:@stdlib/ndarray/ctor}}( mdt, mbuf, sh, sx, ox, ord );
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> {{alias}}( [ x, mask ] )
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0.0
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See Also
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--------
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‎base/ndarray/smskmidrange/docs/types/index.d.ts‎

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/*
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* @license Apache-2.0
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*
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* Copyright (c) 2026 The Stdlib Authors.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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// TypeScript Version: 4.1
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/// <reference types="@stdlib/types"/>
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import { float32ndarray, uint8ndarray } from '@stdlib/types/ndarray';
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/**
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* Calculates the mid-range of a one-dimensional single-precision floating-point ndarray according to a mask.
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*
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* @param arrays - array-like object containing an input ndarray and a mask ndarray
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* @returns mid-range
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*
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* @example
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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 ndarray = require( '@stdlib/ndarray/base/ctor' );
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*
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* var xbuf = new Float32Array( [ 1.0, -2.0, 4.0, 2.0 ] );
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* var x = new ndarray( 'float32', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
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*
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* var mbuf = new Uint8Array( [ 0, 0, 1, 0 ] );
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* var mask = new ndarray( 'uint8', mbuf, [ 4 ], [ 1 ], 0, 'row-major' );
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*
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* var v = smskmidrange( [ x, mask ] );
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* // returns 0.0
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*/
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declare function smskmidrange( arrays: [ float32ndarray, uint8ndarray ] ): number;
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// EXPORTS //
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export = smskmidrange;

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