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feat: add math/base/special/cosm1f
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‎lib/node_modules/@stdlib/math/base/special/cosm1f/README.md‎

Lines changed: 18 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -32,10 +32,10 @@ var cosm1f = require( '@stdlib/math/base/special/cosm1f' );
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#### cosm1f( x )
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35-
Computes `cos(x) - 1`, where `cos` is the [cosine][@stdlib/math/base/special/cos] of a `number` (in radians). This function should be used instead of manually calculating `cos(x) - 1` when the argument is near unity.
35+
Computes `cos(x) - 1`, where `cos` is the [cosine][cosine] of a single-precision floating-point number (in radians). This function should be used instead of manually calculating `cos(x) - 1` when the argument is near unity.
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```javascript
38-
var PI = require( '@stdlib/constants/float64/pi' );
38+
var PI = require( '@stdlib/constants/float32/pi' );
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var v = cosm1f( 0.0 );
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// returns 0.0
@@ -63,11 +63,11 @@ v = cosm1f( NaN );
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```javascript
6464
var uniform = require( '@stdlib/random/array/uniform' );
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var logEachMap = require( '@stdlib/console/log-each-map' );
66-
var PI = require( '@stdlib/constants/float64/pi' );
66+
var PI = require( '@stdlib/constants/float32/pi' );
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var cosm1f = require( '@stdlib/math/base/special/cosm1f' );
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var opts = {
70-
'dtype': 'float64'
70+
'dtype': 'float32'
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};
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var x = uniform( 100, 0.0, 2.0*PI, opts );
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@@ -104,24 +104,24 @@ logEachMap( 'cos(%0.4f) - 1 = %0.4f', x, cosm1f );
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#include "stdlib/math/base/special/cosm1f.h"
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```
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107-
#### stdlib_base_cosm1( x )
107+
#### stdlib_base_cosm1f( x )
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109-
Computes `cos(x) - 1`, where `cos` is the [cosine][@stdlib/math/base/special/cos] of a `number` (in radians). This function should be used instead of manually calculating `cos(x) - 1` when the argument is near unity.
109+
Computes `cos(x) - 1`, where `cos` is the [cosine][cosine] of a single-precision floating-point number (in radians). This function should be used instead of manually calculating `cos(x) - 1` when the argument is near unity.
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```c
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double out = stdlib_base_cosm1( 0.0 );
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// returns 0.0
112+
float out = stdlib_base_cosm1f( 0.0f );
113+
// returns 0.0f
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115-
out = stdlib_base_cosm1( 3.141592653589793238 / 4.0 );
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// returns ~-0.293
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out = stdlib_base_cosm1f( 3.141592653589793238f / 4.0f );
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// returns ~-0.293f
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```
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The function accepts the following arguments:
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121-
- **x**: `[in] double` input value.
121+
- **x**: `[in] float` input value.
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```c
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double stdlib_base_cosm1( const double x );
124+
float stdlib_base_cosm1f( const float x );
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```
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127127
</section>
@@ -147,13 +147,13 @@ double stdlib_base_cosm1( const double x );
147147
#include <stdio.h>
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int main( void ) {
150-
const double x[] = { 0.0, 0.523, 0.785, 1.047, 3.14 };
150+
const float x[] = { 0.0f, 0.523f, 0.785f, 1.047f, 3.14f };
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152-
double y;
152+
float y;
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int i;
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for ( i = 0; i < 5; i++ ) {
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y = stdlib_base_cosm1( x[ i ] );
156-
printf( "cosm1f(%lf) = %lf\n", x[ i ], y );
155+
y = stdlib_base_cosm1f( x[ i ] );
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printf( "cosm1f(%f) = %f\n", x[ i ], y );
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}
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}
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```
@@ -170,12 +170,6 @@ int main( void ) {
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<section class="related">
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* * *
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## See Also
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- <span class="package-name">[`@stdlib/math/base/special/cos`][@stdlib/math/base/special/cos]</span><span class="delimiter">: </span><span class="description">compute the cosine of a number.</span>
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</section>
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<!-- /.related -->
@@ -184,9 +178,9 @@ int main( void ) {
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<section class="links">
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187-
<!-- <related-links> -->
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[cosine]: https://en.wikipedia.org/wiki/Cosine
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189-
[@stdlib/math/base/special/cos]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/cos
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<!-- <related-links> -->
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<!-- </related-links> -->
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‎lib/node_modules/@stdlib/math/base/special/cosm1f/benchmark/benchmark.js‎

Lines changed: 8 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -22,9 +22,9 @@
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var bench = require( '@stdlib/bench' );
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var uniform = require( '@stdlib/random/array/uniform' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
25+
var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
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var pkg = require( './../package.json' ).name;
27-
var cosm1 = require( './../lib' );
27+
var cosm1f = require( './../lib' );
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// MAIN //
@@ -34,17 +34,19 @@ bench( pkg, function benchmark( b ) {
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var y;
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var i;
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37-
x = uniform( 100, -2.0, 2.0 );
37+
x = uniform( 100, -10.0, 10.0, {
38+
'dtype': 'float32'
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});
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3941
b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
41-
y = cosm1( x[ i%x.length ] );
42-
if ( isnan( y ) ) {
43+
y = cosm1f( x[ i%x.length ] );
44+
if ( isnanf( y ) ) {
4345
b.fail( 'should not return NaN' );
4446
}
4547
}
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b.toc();
47-
if ( isnan( y ) ) {
49+
if ( isnanf( y ) ) {
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b.fail( 'should not return NaN' );
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}
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b.pass( 'benchmark finished' );

‎lib/node_modules/@stdlib/math/base/special/cosm1f/benchmark/benchmark.native.js‎

Lines changed: 9 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -23,16 +23,16 @@
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var resolve = require( 'path' ).resolve;
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var bench = require( '@stdlib/bench' );
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var uniform = require( '@stdlib/random/array/uniform' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
26+
var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
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var tryRequire = require( '@stdlib/utils/try-require' );
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var pkg = require( './../package.json' ).name;
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3131
// VARIABLES //
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33-
var cosm1 = tryRequire( resolve( __dirname, './../lib/native.js' ) );
33+
var cosm1f = tryRequire( resolve( __dirname, './../lib/native.js' ) );
3434
var opts = {
35-
'skip': ( cosm1 instanceof Error )
35+
'skip': ( cosm1f instanceof Error )
3636
};
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3838

@@ -43,17 +43,19 @@ bench( pkg+'::native', opts, function benchmark( b ) {
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var y;
4444
var i;
4545

46-
x = uniform( 100, -2.0, 2.0 );
46+
x = uniform( 100, -10.0, 10.0, {
47+
'dtype': 'float32'
48+
});
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4850
b.tic();
4951
for ( i = 0; i < b.iterations; i++ ) {
50-
y = cosm1( x[ i%x.length ] );
51-
if ( isnan( y ) ) {
52+
y = cosm1f( x[ i%x.length ] );
53+
if ( isnanf( y ) ) {
5254
b.fail( 'should not return NaN' );
5355
}
5456
}
5557
b.toc();
56-
if ( isnan( y ) ) {
58+
if ( isnanf( y ) ) {
5759
b.fail( 'should not return NaN' );
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}
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b.pass( 'benchmark finished' );

‎lib/node_modules/@stdlib/math/base/special/cosm1f/benchmark/c/cephes/Makefile‎

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