feat: add stats/incr/nanmmaxabs

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

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 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.
+
+-->
+
+# incrnanmmaxabs
+
+> Compute a moving maximum absolute value incrementally ignoring `NaN` values.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var incrnanmmaxabs = require( '@stdlib/stats/incr/nanmmaxabs' );
+```
+
+#### incrnanmmaxabs( window )
+
+Returns an accumulator `function` which incrementally computes a moving maximum absolute value. The `window` parameter defines the number of values over which to compute the moving maximum absolute value.
+
+```javascript
+var accumulator = incrnanmmaxabs( 3 );
+```
+
+#### accumulator( \[x] )
+
+If provided an input value `x`, the accumulator function returns an updated maximum absolute value. If not provided an input value `x`, the accumulator function returns the current maximum absolute value.
+
+```javascript
+var accumulator = incrnanmmaxabs( 3 );
+
+var m = accumulator();
+// returns null
+
+// Fill the window...
+m = accumulator( 2.0 ); // [2.0]
+// returns 2.0
+
+m = accumulator( NaN ); // [2.0]
+// returns 2.0
+
+m = accumulator( -5.0 ); // [2.0, -5.0]
+// returns 5.0
+
+m = accumulator( -7.0 ); // [2.0, -5.0, -7.0]
+// returns 7.0
+
+m = accumulator( NaN ); // [2.0, -5.0, -7.0]
+// returns 7.0
+
+m = accumulator();
+// returns 7.0
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   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
+
+```javascript
+var randu = require( '@stdlib/random/base/randu' );
+var incrnanmmaxabs = require( '@stdlib/stats/incr/nanmmaxabs' );
+
+var accumulator;
+var m;
+var v;
+var i;
+
+// Initialize an accumulator that *ignores NaNs*
+accumulator = incrnanmmaxabs( 5 );
+
+console.log( '\nValue\tMaxAbs\n' );
+
+// Generate random values and insert some NaNs
+for ( i = 0; i < 100; i++ ) {
+    // Randomly insert NaN values
+    if ( randu() < 0.1 ) {
+        v = NaN;
+    } else {
+        v = ( randu()*100.0 ) - 50.0;
+    }
+
+    m = accumulator( v );
+    console.log( '%s\t%s', ( ( isNaN(v) ) ? 'NaN' : v.toFixed(3)), ( ( m === null ) ? 'null' : m.toFixed(3)));
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- 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 -->

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

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 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 uniform = require( '@stdlib/random/base/uniform' );
+var Float64Array = require( '@stdlib/array/float64' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var incrnanmmaxabs = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var f;
+	var i;
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		f = incrnanmmaxabs( ( 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( format( '%s::accumulator', pkg ), function benchmark( b ) {
+	var acc;
+	var v;
+	var x;
+	var i;
+
+	acc = incrnanmmaxabs( 5 );
+
+	x = new Float64Array( b.iterations );
+	for ( i = 0; i < b.iterations; i++ ) {
+		if ( ( i & 7 ) === 0 ) {
+			x[ i ] = NaN;
+		} else {
+			x[ i ] = uniform( -100.0, 100.0 );
+		}
+	}
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		v = acc( x[ i ] );
+		if ( isnan( v ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( v ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

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

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+
+{{alias}}( W )
+    Returns an accumulator function which incrementally computes a moving
+    maximum absolute value while ignoring `NaN` values.
+
+    The `W` parameter defines the number of values over which to compute the
+    moving maximum absolute value.
+
+    If provided a value, the accumulator function returns an updated moving
+    maximum absolute value. If not provided a value, the accumulator function
+    returns the current moving maximum absolute value.
+
+    Any `NaN` values provided to the accumulator are ignored, and do not
+    affect the accumulated result.
+
+    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 non-NaN values.
+
+    Parameters
+    ----------
+    W: integer
+        Window size.
+
+    Returns
+    -------
+    acc: Function
+        Accumulator function.
+
+    Examples
+    --------
+    > var accumulator = {{alias}}( 3 );
+    > var m = accumulator()
+    null
+    > m = accumulator( 2.0 )
+    2.0
+    > m = accumulator( NaN )
+    2.0
+    > m = accumulator( -5.0 )
+    5.0
+    > m = accumulator( 3.0 )
+    5.0
+    > m = accumulator()
+    5.0
+
+    See Also
+    --------

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

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 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 moving maximum absolute value; otherwise, returns the current maximum absolute value.
+*
+*
+* @param x - value
+* @returns moving maximum absolute value
+*/
+type accumulator = ( x?: number ) => number | null;
+
+/**
+* Returns an accumulator function which incrementally computes a moving maximum absolute value while ignoring `NaN` values.
+*
+* ## Notes
+*
+* -   The `W` parameter defines the number of values over which to compute the moving maximum absolute value.
+* -   Until the window is full, each returned value is calculated from all non-NaN values received so far. `NaN` values are skipped and do not enter the moving window.
+*
+* @param W - window size
+* @throws must provide a positive integer
+* @returns accumulator function
+*
+* @example
+* var accumulator = incrnanmmaxabs( 3 );
+*
+* var m = accumulator();
+* // returns null
+*
+* m = accumulator( 2.0 );
+* // returns 2.0
+*
+* m = accumulator( NaN );
+* // returns 2.0
+*
+* m = accumulator( -5.0 );
+* // returns 5.0
+*
+* m = accumulator( NaN );
+* // returns 5.0
+*/
+declare function incrnanmmaxabs( W: number ): accumulator;
+
+
+// EXPORTS //
+
+export = incrnanmmaxabs;