Skip to content

Commit e0195dc

Browse files
manvith2003Planeshifter
manvith2003
and
Planeshifter
authored
feat: add C implementation for stats/base/dists/frechet/kurtosis
PR-URL: #4604 Closes: #3606 Co-authored-by: Philipp Burckhardt <pburckhardt@outlook.com> Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com> Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>
1 parent 694f362 commit e0195dc

File tree

16 files changed

+1356
-3
lines changed

16 files changed

+1356
-3
lines changed

‎lib/node_modules/@stdlib/stats/base/dists/frechet/kurtosis/README.md

Lines changed: 94 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -156,13 +156,104 @@ for ( i = 0; i < 10; i++ ) {
156156

157157
<!-- /.examples -->
158158

159-
<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
159+
<!-- C interface documentation. -->
160160

161-
<section class="references">
161+
* * *
162+
163+
<section class="c">
164+
165+
## C APIs
166+
167+
<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
168+
169+
<section class="intro">
170+
171+
</section>
172+
173+
<!-- /.intro -->
174+
175+
<!-- C usage documentation. -->
176+
177+
<section class="usage">
178+
179+
### Usage
180+
181+
```c
182+
#include "stdlib/stats/base/dists/frechet/kurtosis.h"
183+
```
184+
185+
#### stdlib_base_dists_frechet_kurtosis( alpha, s, m )
186+
187+
Returns the excess kurtosis for a Fréchet distribution with shape `alpha`, scale `s`, and location `m`.
188+
189+
```c
190+
double y = stdlib_base_dists_frechet_kurtosis( 5.0, 2.0, 0.0 );
191+
// returns ~45.092
192+
```
193+
194+
The function accepts the following arguments:
195+
196+
- **alpha**: `[in] double` shape parameter.
197+
- **s**: `[in] double` scale parameter.
198+
- **m**: `[in] double` location parameter.
199+
200+
```c
201+
double stdlib_base_dists_frechet_kurtosis( const double alpha, const double s, const double m );
202+
```
203+
204+
</section>
205+
206+
<!-- /.usage -->
207+
208+
<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
209+
210+
<section class="notes">
211+
212+
</section>
213+
214+
<!-- /.notes -->
215+
216+
<!-- C API usage examples. -->
217+
218+
<section class="examples">
219+
220+
### Examples
221+
222+
```c
223+
#include "stdlib/stats/base/dists/frechet/kurtosis.h"
224+
#include "stdlib/constants/float64/eps.h"
225+
#include <stdlib.h>
226+
#include <stdio.h>
227+
228+
static double random_uniform( const double min, const double max ) {
229+
double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
230+
return min + ( v*(max-min) );
231+
}
232+
233+
int main( void ) {
234+
double alpha;
235+
double s;
236+
double m;
237+
double y;
238+
int i;
239+
240+
for ( i = 0; i < 10; i++ ) {
241+
alpha = random_uniform( STDLIB_CONSTANT_FLOAT64_EPS, 20.0 );
242+
s = random_uniform( STDLIB_CONSTANT_FLOAT64_EPS, 20.0 );
243+
m = random_uniform( -40.0, -20.0 );
244+
y = stdlib_base_dists_frechet_kurtosis( alpha, s, m );
245+
printf( "α: %.4lf, s: %.4lf, m: %.4lf, Kurt(X;α,s,m): %.4lf\n", alpha, s, m, y );
246+
}
247+
}
248+
```
249+
250+
</section>
251+
252+
<!-- /.examples -->
162253

163254
</section>
164255

165-
<!-- /.references -->
256+
<!-- /.c -->
166257

167258
<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
168259

‎lib/node_modules/@stdlib/stats/base/dists/frechet/kurtosis/benchmark/benchmark.native.js

Lines changed: 73 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,73 @@
1+
/**
2+
* @license Apache-2.0
3+
*
4+
* Copyright (c) 2025 The Stdlib Authors.
5+
*
6+
* Licensed under the Apache License, Version 2.0 (the "License");
7+
* you may not use this file except in compliance with the License.
8+
* You may obtain a copy of the License at
9+
*
10+
* http://www.apache.org/licenses/LICENSE-2.0
11+
*
12+
* Unless required by applicable law or agreed to in writing, software
13+
* distributed under the License is distributed on an "AS IS" BASIS,
14+
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15+
* See the License for the specific language governing permissions and
16+
* limitations under the License.
17+
*/
18+
19+
'use strict';
20+
21+
// MODULES //
22+
23+
var resolve = require( 'path' ).resolve;
24+
var bench = require( '@stdlib/bench' );
25+
var Float64Array = require( '@stdlib/array/float64' );
26+
var uniform = require( '@stdlib/random/base/uniform' );
27+
var isnan = require( '@stdlib/math/base/assert/is-nan' );
28+
var tryRequire = require( '@stdlib/utils/try-require' );
29+
var EPS = require( '@stdlib/constants/float64/eps' );
30+
var pkg = require( './../package.json' ).name;
31+
32+
33+
// VARIABLES //
34+
35+
var kurtosis = tryRequire( resolve( __dirname, './../lib/native.js' ) );
36+
var opts = {
37+
'skip': ( kurtosis instanceof Error )
38+
};
39+
40+
41+
// MAIN //
42+
43+
bench( pkg+'::native', opts, function benchmark( b ) {
44+
var alpha;
45+
var len;
46+
var s;
47+
var m;
48+
var y;
49+
var i;
50+
51+
len = 100;
52+
alpha = new Float64Array( len );
53+
s = new Float64Array( len );
54+
m = new Float64Array( len );
55+
for ( i = 0; i < len; i++ ) {
56+
alpha[ i ] = uniform( EPS, 20.0 );
57+
s[ i ] = uniform( EPS, 20.0 );
58+
m[ i ] = uniform( -20.0, 20.0 );
59+
}
60+
b.tic();
61+
for ( i = 0; i < b.iterations; i++ ) {
62+
y = kurtosis( alpha[ i % len ], s[ i % len ], m[ i % len ] );
63+
if ( isnan( y ) ) {
64+
b.fail( 'should not return NaN' );
65+
}
66+
}
67+
b.toc();
68+
if ( isnan( y ) ) {
69+
b.fail( 'should not return NaN' );
70+
}
71+
b.pass( 'benchmark finished' );
72+
b.end();
73+
});

‎lib/node_modules/@stdlib/stats/base/dists/frechet/kurtosis/benchmark/c/Makefile

Lines changed: 146 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,146 @@
1+
#/
2+
# @license Apache-2.0
3+
#
4+
# Copyright (c) 2025 The Stdlib Authors.
5+
#
6+
# Licensed under the Apache License, Version 2.0 (the "License");
7+
# you may not use this file except in compliance with the License.
8+
# You may obtain a copy of the License at
9+
#
10+
# http://www.apache.org/licenses/LICENSE-2.0
11+
#
12+
# Unless required by applicable law or agreed to in writing, software
13+
# distributed under the License is distributed on an "AS IS" BASIS,
14+
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15+
# See the License for the specific language governing permissions and
16+
# limitations under the License.
17+
#/
18+
19+
# VARIABLES #
20+
21+
ifndef VERBOSE
22+
QUIET := @
23+
else
24+
QUIET :=
25+
endif
26+
27+
# Determine the OS ([1][1], [2][2]).
28+
#
29+
# [1]: https://en.wikipedia.org/wiki/Uname#Examples
30+
# [2]: http://stackoverflow.com/a/27776822/2225624
31+
OS ?= $(shell uname)
32+
ifneq (, $(findstring MINGW,$(OS)))
33+
OS := WINNT
34+
else
35+
ifneq (, $(findstring MSYS,$(OS)))
36+
OS := WINNT
37+
else
38+
ifneq (, $(findstring CYGWIN,$(OS)))
39+
OS := WINNT
40+
else
41+
ifneq (, $(findstring Windows_NT,$(OS)))
42+
OS := WINNT
43+
endif
44+
endif
45+
endif
46+
endif
47+
48+
# Define the program used for compiling C source files:
49+
ifdef C_COMPILER
50+
CC := $(C_COMPILER)
51+
else
52+
CC := gcc
53+
endif
54+
55+
# Define the command-line options when compiling C files:
56+
CFLAGS ?= \
57+
-std=c99 \
58+
-O3 \
59+
-Wall \
60+
-pedantic
61+
62+
# Determine whether to generate position independent code ([1][1], [2][2]).
63+
#
64+
# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
65+
# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
66+
ifeq ($(OS), WINNT)
67+
fPIC ?=
68+
else
69+
fPIC ?= -fPIC
70+
endif
71+
72+
# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`):
73+
INCLUDE ?=
74+
75+
# List of source files:
76+
SOURCE_FILES ?=
77+
78+
# List of libraries (e.g., `-lopenblas -lpthread`):
79+
LIBRARIES ?=
80+
81+
# List of library paths (e.g., `-L /foo/bar -L /beep/boop`):
82+
LIBPATH ?=
83+
84+
# List of C targets:
85+
c_targets := benchmark.out
86+
87+
88+
# RULES #
89+
90+
#/
91+
# Compiles source files.
92+
#
93+
# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`)
94+
# @param {string} [CFLAGS] - C compiler options
95+
# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
96+
# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`)
97+
# @param {string} [SOURCE_FILES] - list of source files
98+
# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`)
99+
# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`)
100+
#
101+
# @example
102+
# make
103+
#
104+
# @example
105+
# make all
106+
#/
107+
all: $(c_targets)
108+
109+
.PHONY: all
110+
111+
#/
112+
# Compiles C source files.
113+
#
114+
# @private
115+
# @param {string} CC - C compiler (e.g., `gcc`)
116+
# @param {string} CFLAGS - C compiler options
117+
# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
118+
# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`)
119+
# @param {string} SOURCE_FILES - list of source files
120+
# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`)
121+
# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`)
122+
#/
123+
$(c_targets): %.out: %.c
124+
$(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES)
125+
126+
#/
127+
# Runs compiled benchmarks.
128+
#
129+
# @example
130+
# make run
131+
#/
132+
run: $(c_targets)
133+
$(QUIET) ./$<
134+
135+
.PHONY: run
136+
137+
#/
138+
# Removes generated files.
139+
#
140+
# @example
141+
# make clean
142+
#/
143+
clean:
144+
$(QUIET) -rm -f *.o *.out
145+
146+
.PHONY: clean

0 commit comments

Comments
 (0)