feat: add lapack/base/dlamch

lib/node_modules/@stdlib/lapack/base/dlamch/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 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.
+
+-->
+
+# dlamch
+
+> Determine double-precision floating-point machine parameters.
+
+<section class = "usage">
+
+## Usage
+
+```javascript
+var dlamch = require( '@stdlib/lapack/base/dlamch' );
+```
+
+#### dlamch( cmach )
+
+Determines double-precision floating-point machine parameters.
+
+```javascript
+var out = dlamch( 'E' );
+// returns 1.1102230246251565e-16
+```
+
+The function has the following parameters:
+
+-   **cmach**: specifies the value to be returned. The following characters are supported:
+
+    -   `'E'`/`'e'`: (eps) relative machine precision.
+    -   `'S'`/`'s'`: (sfmin) safe minimum such that `1/sfmin` does not overflow.
+    -   `'B'`/`'b'`: (base) base of the machine (also known as the floating-point radix).
+    -   `'P'`/`'p'`: (prec) `eps*base`.
+    -   `'N'`/`'n'`: (t) number of (base) digits in the mantissa.
+    -   `'R'`/`'r'`: (rnd) `1.0` when rounding occurs in addition and `0.0` otherwise.
+    -   `'M'`/`'m'`: (emin) minimum exponent before (gradual) underflow.
+    -   `'U'`/`'u'`: (rmin) underflow threshold.
+    -   `'L'`/`'l'`: (emax) largest exponent before overflow.
+    -   `'O'`/`'o'`: (rmax) overflow threshold.
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   `dlamch()` corresponds to the [LAPACK][lapack] function [`dlamch`][lapack-dlamch].
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var dlamch = require( '@stdlib/lapack/base/dlamch' );
+
+var out = dlamch( 'E' );
+console.log( 'Precision: %d', out );
+
+out = dlamch( 'S' );
+console.log( 'Safe minimum: %d', out );
+
+out = dlamch( 'B' );
+console.log( 'Base: %d', out );
+
+out = dlamch( 'P' );
+console.log( 'Precision*base: %d', out );
+
+out = dlamch( 'N' );
+console.log( 'Number of digits in mantissa: %d', out );
+
+out = dlamch( 'R' );
+console.log( 'Rounding: %d', out );
+
+out = dlamch( 'M' );
+console.log( 'Minimum exponent before underflow: %d', out );
+
+out = dlamch( 'U' );
+console.log( 'Underflow threshold: %d', out );
+
+out = dlamch( 'L' );
+console.log( 'Maximum exponent before overflow: %d', out );
+
+out = dlamch( 'O' );
+console.log( 'Overflow threshold: %d', out );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+TODO
+```
+
+#### TODO
+
+TODO.
+
+```c
+TODO
+```
+
+TODO
+
+```c
+TODO
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+TODO
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- 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">
+
+[lapack]: https://www.netlib.org/lapack/explore-html/
+
+[lapack-dlamch]: https://www.netlib.org/lapack/explore-html/d4/d86/group__lamch_gaeab255e77cbd3b0f31aea74ed0ce099e.html#gaeab255e77cbd3b0f31aea74ed0ce099e
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/lapack/base/dlamch/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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 pkg = require( './../package.json' ).name;
+var dlamch = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var values;
+	var out;
+	var i;
+
+	values = [
+		'E',
+		'S',
+		'B',
+		'P',
+		'N',
+		'R',
+		'M',
+		'U',
+		'L',
+		'O',
+		'e',
+		's',
+		'b',
+		'p',
+		'n',
+		'r',
+		'm',
+		'u',
+		'l',
+		'o'
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = dlamch( values[ i%values.length ] );
+		if ( typeof out !== 'number' ) {
+			b.fail( 'should return a number' );
+		}
+	}
+	b.toc();
+	if ( typeof out !== 'number' ) {
+		b.fail( 'should return a number' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/lapack/base/dlamch/docs/repl.txt

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+
+{{alias}}( cmach )
+    Determines double-precision floating-point machine parameters.
+
+    The `cmach` parameter is a string which specifies the double-precision
+    machine parameter to be returned. The function recognizes the following
+    characters:
+
+    - 'E'/'e': (eps) relative machine precision.
+    - 'S'/'s': (sfmin) safe minimum such that `1/sfmin` does not overflow.
+    - 'B'/'b': (base) base of the machine (also known as the radix).
+    - 'P'/'p': (prec) `eps*base`.
+    - 'N'/'n': (t) number of (base) digits in the mantissa.
+    - 'R'/'r': (rnd) `1.0` when rounding occurs in addition and `0.0` otherwise.
+    - 'M'/'m': (emin) minimum exponent before (gradual) underflow.
+    - 'U'/'u': (rmin) underflow threshold.
+    - 'L'/'l': (emax) largest exponent before overflow.
+    - 'O'/'o': (rmax) overflow threshold.
+
+    Parameters
+    ----------
+    cmach: string
+        Specifies the value to be returned.
+
+    Returns
+    -------
+    out: number
+        Machine parameter.
+
+    Examples
+    --------
+    > var y = {{alias}}( 'E' )
+    1.1102230246251565e-16
+    > y = {{alias}}( 'S' )
+    2.2250738585072014e-308
+    > y = {{alias}}( 'B' )
+    2.0
+    > y = {{alias}}( 'P' )
+    2.2204460492503131e-16
+
+    See Also
+    --------

lib/node_modules/@stdlib/lapack/base/dlamch/docs/types/index.d.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2019 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
+
+/**
+* Parameter type.
+*/
+type CMACH = 'E' | 'e' | 'S' | 's' | 'B' | 'b' | 'P' | 'p' | 'N' | 'n' | 'R' | 'r' | 'M' | 'm' | 'U' | 'u' | 'L' | 'l' | 'O' | 'o';
+
+/**
+* Determines double-precision floating-point machine parameters.
+*
+* ## Notes
+*
+* -   The `cmach` parameter is a string which specifies the double-precision machine parameter to be returned. The function recognizes the following characters:
+*
+*     -   `'E'`/`'e'`: (eps) relative machine precision.
+*     -   `'S'`/`'s'`: (sfmin) safe minimum such that `1/sfmin` does not overflow.
+*     -   `'B'`/`'b'`: (base) base of the machine (also known as the floating-point radix).
+*     -   `'P'`/`'p'`: (prec) `eps*base`.
+*     -   `'N'`/`'n'`: (t) number of (base) digits in the mantissa.
+*     -   `'R'`/`'r'`: (rnd) `1.0` when rounding occurs in addition and `0.0` otherwise.
+*     -   `'M'`/`'m'`: (emin) minimum exponent before (gradual) underflow.
+*     -   `'U'`/`'u'`: (rmin) underflow threshold.
+*     -   `'L'`/`'l'`: (emax) largest exponent before overflow.
+*     -   `'O'`/`'o'`: (rmax) overflow threshold.
+*
+* @param cmach - specifies the value to be returned
+* @returns machine parameter
+*
+* @example
+* var out = dlamch( 'E' );
+* // returns ~1.1102230246251565E-016
+*
+* out = dlamch( 'S' );
+* // returns ~2.2250738585072014E-308
+*
+* out = dlamch( 'B' );
+* // returns 2.0
+*/
+declare function dlamch( x: CMACH | string ): number;
+
+
+// EXPORTS //
+
+export = dlamch;