feat(stats): add nanmmidrange package

lib/node_modules/@stdlib/stats/incr/nanmmidrange/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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.
+
+-->
+
+# incrnanmmidrange
+
+> Compute a moving [mid-range][mid-range] incrementally, ignoring `NaN` values.
+
+<section class="intro">
+
+The [**mid-range**][mid-range], or **mid-extreme**, is the arithmetic mean of maximum and minimum values. Accordingly, the [mid-range][mid-range] is the midpoint of the [range][range] and a measure of central tendency.
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var incrnanmmidrange = require( '@stdlib/stats/incr/nanmmidrange' );
+```
+
+#### incrnanmmidrange( window )
+
+Returns an accumulator `function` which incrementally computes a moving [mid-range][mid-range], ignoring `NaN` values. The `window` parameter defines the number of values over which to compute the moving [mid-range][mid-range].
+
+```javascript
+var accumulator = incrnanmmidrange( 3 );
+```
+
+#### accumulator( \[x] )
+
+If provided an input value `x`, the accumulator function returns an updated [mid-range][mid-range]. If not provided an input value `x`, the accumulator function returns the current [mid-range][mid-range].
+
+```javascript
+var accumulator = incrnanmmidrange( 3 );
+
+var mr = accumulator();
+// returns null
+
+// Fill the window...
+mr = accumulator( 2.0 ); // [2.0]
+// returns 2.0
+
+mr = accumulator( 1.0 ); // [2.0, 1.0]
+// returns 1.5
+
+mr = accumulator( 3.0 ); // [2.0, 1.0, 3.0]
+// returns 2.0
+
+// Window begins sliding...
+mr = accumulator( -7.0 ); // [1.0, 3.0, -7.0]
+// returns -2.0
+
+mr = accumulator( NaN ); // [1.0, 3.0, -7.0]
+// returns -2.0
+
+mr = accumulator( -5.0 ); // [3.0, -7.0, -5.0]
+// returns -2.0
+
+mr = accumulator();
+// returns -2.0
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   Input values are **not** type checked. If non-numeric inputs are possible, you are advised to type check and handle accordingly **before** passing the value to the accumulator function.
+-   As `W` values are needed to fill the window buffer, the first `W-1` returned values are calculated from smaller sample sizes. Until the window is full, each returned value is calculated from all provided values.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var randu = require( '@stdlib/random/base/randu' );
+var incrmmidrange = require( '@stdlib/stats/incr/mmidrange' );
+
+var accumulator;
+var v;
+var i;
+
+// Initialize an accumulator:
+accumulator = incrmmidrange( 5 );
+
+// For each simulated datum, update the moving mid-range...
+for ( i = 0; i < 100; i++ ) {
+    v = randu() * 100.0;
+    accumulator( v );
+}
+console.log( accumulator() );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+* * *
+
+## See Also
+
+-   <span class="package-name">[`@stdlib/stats/incr/mmean`][@stdlib/stats/incr/mmean]</span><span class="delimiter">: </span><span class="description">compute a moving arithmetic mean incrementally.</span>
+-   <span class="package-name">[`@stdlib/stats/incr/mmax`][@stdlib/stats/incr/mmax]</span><span class="delimiter">: </span><span class="description">compute a moving maximum incrementally.</span>
+-   <span class="package-name">[`@stdlib/stats/incr/mmin`][@stdlib/stats/incr/mmin]</span><span class="delimiter">: </span><span class="description">compute a moving minimum incrementally.</span>
+-   <span class="package-name">[`@stdlib/stats/incr/mrange`][@stdlib/stats/incr/mrange]</span><span class="delimiter">: </span><span class="description">compute a moving range incrementally.</span>
+
+</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">
+
+[range]: https://en.wikipedia.org/wiki/Range_%28statistics%29
+
+[mid-range]: https://en.wikipedia.org/wiki/Mid-range
+
+<!-- <related-links> -->
+
+[@stdlib/stats/incr/mmean]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/mmean
+
+[@stdlib/stats/incr/mmax]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/mmax
+
+[@stdlib/stats/incr/mmin]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/mmin
+
+[@stdlib/stats/incr/mrange]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/mrange
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/stats/incr/nanmmidrange/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var randu = require( '@stdlib/random/base/randu' );
+var pkg = require( './../package.json' ).name;
+var incrnanmmidrange = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var f;
+	var i;
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		f = incrnanmmidrange( (i%5)+1 );
+		if ( typeof f !== 'function' ) {
+			b.fail( 'should return a function' );
+		}
+	}
+	b.toc();
+	if ( typeof f !== 'function' ) {
+		b.fail( 'should return a function' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( pkg+'::accumulator', function benchmark( b ) {
+	var acc;
+	var v;
+	var i;
+
+	acc = incrnanmmidrange( 5 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		v = acc( randu() );
+		if ( v !== v ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( v !== v ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/stats/incr/nanmmidrange/docs/repl.txt

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+
+{{alias}}( W )
+    Returns an accumulator function which incrementally computes a moving mid-
+    range, ignoring `NaN` values.
+
+    The mid-range is the arithmetic mean of maximum and minimum values.
+    Accordingly, the mid-range is the midpoint of the range and a measure of
+    central tendency.
+
+    The `W` parameter defines the number of values over which to compute
+    the moving mid-range.
+
+    If provided a value, the accumulator function returns an updated moving mid-
+    range. If not provided a value, the accumulator function returns the current
+    moving mid-range.
+
+    As `W` values are needed to fill the window buffer, the first `W-1` returned
+    values are calculated from smaller sample sizes. Until the window is full,
+    each returned value is calculated from all provided values.
+
+    Parameters
+    ----------
+    W: integer
+        Window size.
+
+    Returns
+    -------
+    acc: Function
+        Accumulator function.
+
+    Examples
+    --------
+    > var accumulator = {{alias}}( 3 );
+    > var mr = accumulator()
+    null
+    > mr = accumulator( 2.0 )
+    2.0
+    > mr = accumulator( -5.0 )
+    -1.5
+    > mr = accumulator( 3.0 )
+    -1.0
+    > mr = accumulator( 5.0 )
+    0.0
+    mr = accumulator( NaN )
+    0.0
+    > mr = accumulator()
+    0.0
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/stats/incr/nanmmidrange/docs/types/index.d.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+/**
+* If provided a value, returns an updated mid-range; otherwise, returns the current mid-range.
+*
+* ## Notes
+*
+* -   The mid-range is the arithmetic mean of maximum and minimum values. Accordingly, the mid-range is the midpoint of the range and a measure of central tendency.
+*
+* @param x - value
+* @returns mid-range
+*/
+type accumulator = ( x?: number ) => number | null;
+
+/**
+* Returns an accumulator function which incrementally computes a moving mid-range.
+*
+* ## Notes
+*
+* -   The `W` parameter defines the number of values over which to compute the moving mid-range.
+* -   As `W` values are needed to fill the window buffer, the first `W-1` returned values are calculated from smaller sample sizes. Until the window is full, each returned value is calculated from all provided values.
+*
+* @param W - window size
+* @throws must provide a positive integer
+* @returns accumulator function
+*
+* @example
+* var accumulator = incrmmidrange( 3 );
+*
+* var mr = accumulator();
+* // returns null
+*
+* mr = accumulator( 2.0 );
+* // returns 2.0
+* 
+* mr = accumulator( -5.0 );
+* // returns -1.5
+*
+* mr = accumulator( 3.0 );
+* // returns -1.0
+*
+* mr = accumulator( 5.0 );
+* // returns 0.0
+* 
+* mr = accumulator( NaN );
+* // returns 0.0
+*
+* mr = accumulator();
+* // returns 0.0
+*/
+declare function incrnanmmidrange( W: number ): accumulator;
+
+
+// EXPORTS //
+
+export = incrnanmmidrange;