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feat: add math/base/special/negalucasf
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feat: basic files added
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lib/node_modules/@stdlib/math/base/special/negalucasf/README.md
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<!-- | ||
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@license Apache-2.0 | ||
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Copyright (c) 2024 The Stdlib Authors. | ||
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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 | ||
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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 | ||
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. | ||
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--> | ||
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# negaLucas | ||
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> Compute the nth [negaLucas number][lucas-number] in single-precision floating-point format. | ||
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<section class="intro"> | ||
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The [negaLucas numbers][lucas-number] are the integer sequence | ||
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<!-- <equation class="equation" label="eq:negalucasf_sequence" align="center" raw="2, -1, 3, -4, 7, -11, 18, -29, 47, -76, 123, -199, 322, \ldots" alt="NegaLucas sequence"> --> | ||
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```math | ||
2, -1, 3, -4, 7, -11, 18, -29, 47, -76, 123, -199, 322, \ldots | ||
``` | ||
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<!-- <div class="equation" align="center" data-raw-text="2, -1, 3, -4, 7, -11, 18, -29, 47, -76, 123, -199, 322, \ldots" data-equation="eq:negalucasf_sequence"> | ||
<img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@bb29798906e119fcb2af99e94b60407a270c9b32/lib/node_modules/@stdlib/math/base/special/negalucasf/docs/img/equation_negalucas_sequence.svg" alt="NegaLucas sequence"> | ||
<br> | ||
</div> --> | ||
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<!-- </equation> --> | ||
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The sequence is defined by the recurrence relation | ||
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<!-- <equation class="equation" label="eq:negalucasf_recurrence_relation" align="center" raw="L_{n-2} = L_{n} - L_{n-1}" alt="NegaLucas sequence recurrence relation"> --> | ||
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```math | ||
L_{n-2} = L_{n} - L_{n-1} | ||
``` | ||
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<!-- <div class="equation" align="center" data-raw-text="L_{n-2} = L_{n} - L_{n-1}" data-equation="eq:negalucasf_recurrence_relation"> | ||
<img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@bb29798906e119fcb2af99e94b60407a270c9b32/lib/node_modules/@stdlib/math/base/special/negalucasf/docs/img/equation_negalucas_recurrence_relation.svg" alt="NegaLucas sequence recurrence relation"> | ||
<br> | ||
</div> --> | ||
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<!-- </equation> --> | ||
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which yields | ||
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<!-- <equation class="equation" label="eq:negalucasf_lucas" align="center" raw="L_{-n} = (-1)^{n} L_n" alt="NegaLucas relationship to Lucas numbers"> --> | ||
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```math | ||
L_{-n} = (-1)^{n} L_n | ||
``` | ||
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<!-- <div class="equation" align="center" data-raw-text="L_{-n} = (-1)^{n} L_n" data-equation="eq:negalucasf_lucas"> | ||
<img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@bb29798906e119fcb2af99e94b60407a270c9b32/lib/node_modules/@stdlib/math/base/special/negalucasf/docs/img/equation_negalucas_lucas.svg" alt="NegaLucas relationship to Lucas numbers"> | ||
<br> | ||
</div> --> | ||
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<!-- </equation> --> | ||
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with seed values `L_0 = 2` and `L_{-1} = -1`. | ||
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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 | ||
var negalucasf = require( '@stdlib/math/base/special/negalucasf' ); | ||
``` | ||
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#### negalucasf( n ) | ||
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Computes the nth [negaLucas number][lucas-number] in single-precision floating-point format. | ||
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```javascript | ||
var v = negalucasf( 0 ); | ||
// returns 2 | ||
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v = negalucasf( -1 ); | ||
// returns -1 | ||
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v = negalucasf( -2 ); | ||
// returns 3 | ||
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v = negalucasf( -3 ); | ||
// returns -4 | ||
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v = negalucasf( -34 ); | ||
// returns 12752043 | ||
``` | ||
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If `n < -34`, the function returns `NaN`, as larger [negaLucas numbers][lucas-number] cannot be safely represented in [single-precision floating-point format][ieee754]. | ||
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```javascript | ||
var v = negalucasf( -35 ); | ||
// returns NaN | ||
``` | ||
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If not provided a nonpositive integer value, the function returns `NaN`. | ||
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```javascript | ||
var v = negalucasf( -3.14 ); | ||
// returns NaN | ||
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v = negalucasf( 1 ); | ||
// returns NaN | ||
``` | ||
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If provided `NaN`, the function returns `NaN`. | ||
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```javascript | ||
var v = negalucasf( NaN ); | ||
// returns NaN | ||
``` | ||
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</section> | ||
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<!-- /.usage --> | ||
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<section class="notes"> | ||
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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 | ||
var negalucasf = require( '@stdlib/math/base/special/negalucasf' ); | ||
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var v; | ||
var i; | ||
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for ( i = 0; i > -35; i-- ) { | ||
v = negalucasf( i ); | ||
console.log( v ); | ||
} | ||
``` | ||
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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 | ||
#include "stdlib/math/base/special/negalucasf.h" | ||
``` | ||
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#### stdlib_base_negalucasf( n ) | ||
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Computes the nth [negaLucas number][lucas-number] in single-precision floating-point format. | ||
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```c | ||
float out = stdlib_base_negalucasf( 0 ); | ||
// returns 0.0f | ||
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out = stdlib_base_negalucasf( -1 ); | ||
// returns -1.0f | ||
``` | ||
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The function accepts the following arguments: | ||
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- **n**: `[in] int32_t` input value. | ||
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```c | ||
float stdlib_base_negalucasf( const int32_t n ); | ||
``` | ||
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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 | ||
#include "stdlib/math/base/special/negalucasf.h" | ||
#include <stdio.h> | ||
#include <stdint.h> | ||
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int main( void ) { | ||
int32_t i; | ||
float v; | ||
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for ( i = 0; i > -77; i-- ) { | ||
v = stdlib_base_negalucasf( i ); | ||
printf( "negalucasf(%d) = %f\n", i, v ); | ||
} | ||
} | ||
``` | ||
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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 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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[lucas-number]: https://en.wikipedia.org/wiki/Lucas_number | ||
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[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985 | ||
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<!-- <related-links> --> | ||
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<!-- </related-links> --> | ||
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</section> | ||
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<!-- /.links --> |
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