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Add error and gamma functions

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Fixes #99
This commit is contained in:
Justine Tunney 2021-03-02 11:57:19 -08:00
parent d53a344e18
commit 32e289b1d8
11 changed files with 1187 additions and 0 deletions
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38
test/libc/tinymath/erf_test.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/math.h"
#include "libc/runtime/gc.h"
#include "libc/testlib/testlib.h"
#include "libc/x/x.h"
TEST(erf, test) {
EXPECT_STREQ("NAN", gc(xdtoa(erf(NAN))));
EXPECT_STREQ("0", gc(xdtoa(erf(0))));
EXPECT_STREQ("1", gc(xdtoa(erf(INFINITY))));
EXPECT_STREQ(".999977909503001", gc(xdtoa(erf(3))));
}
TEST(erfc, test) {
EXPECT_STREQ("NAN", gc(xdtoa(erfc(NAN))));
EXPECT_STREQ("1", gc(xdtoa(erfc(0))));
EXPECT_STREQ("1", gc(xdtoa(erfc(-0.))));
EXPECT_STREQ("0", gc(xdtoa(erfc(INFINITY))));
EXPECT_STREQ("2", gc(xdtoa(erfc(-INFINITY))));
EXPECT_STREQ("2.20904969985854e-05", gc(xdtoa(erfc(3))));
}

33
test/libc/tinymath/gamma_test.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/math.h"
#include "libc/runtime/gc.h"
#include "libc/testlib/testlib.h"
#include "libc/x/x.h"
TEST(lgamma, test) {
EXPECT_STREQ("NAN", gc(xdtoa(lgamma(NAN))));
EXPECT_STREQ("0", gc(xdtoa(lgamma(1))));
EXPECT_STREQ("0", gc(xdtoa(lgamma(2))));
EXPECT_STREQ("INFINITY", gc(xdtoa(lgamma(INFINITY))));
EXPECT_STREQ("INFINITY", gc(xdtoa(lgamma(-INFINITY))));
EXPECT_STREQ("INFINITY", gc(xdtoa(lgamma(-1))));
EXPECT_STREQ("INFINITY", gc(xdtoa(lgamma(-2))));
EXPECT_STREQ("1.26551212348465", gc(xdtoa(lgamma(-.5))));
}