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#include "m.h"
#include <iostream>
#include <gtest/gtest.h>
#include <cassert>
using namespace std;
class MTest : public testing::Test {
public:
MTest() {}
protected:
virtual void SetUp() { }
virtual void TearDown() { }
};
TEST_F(MTest, Poisson) {
double prev = 1.0;
double tot = 0;
for (int i = 0; i < 10; ++i) {
double p = Md::log_poisson(i, 0.99);
cerr << "p(i=" << i << ") = " << exp(p) << endl;
EXPECT_LT(p, prev);
tot += exp(p);
prev = p;
}
cerr << " tot=" << tot << endl;
EXPECT_LE(tot, 1.0);
}
TEST_F(MTest, YuleSimon) {
double prev = 1.0;
double tot = 0;
for (int i = 0; i < 10; ++i) {
double p = Md::log_yule_simon(i, 1.0);
cerr << "p(i=" << i << ") = " << exp(p) << endl;
EXPECT_LT(p, prev);
tot += exp(p);
prev = p;
}
cerr << " tot=" << tot << endl;
EXPECT_LE(tot, 1.0);
}
TEST_F(MTest, LogGeometric) {
double prev = 1.0;
double tot = 0;
for (int i = 0; i < 10; ++i) {
double p = Md::log_geometric(i, 0.5);
cerr << "p(i=" << i << ") = " << exp(p) << endl;
EXPECT_LT(p, prev);
tot += exp(p);
prev = p;
}
cerr << " tot=" << tot << endl;
EXPECT_LE(tot, 1.0);
}
TEST_F(MTest, GeneralizedFactorial) {
for (double i = 0.3; i < 10000; i += 0.4) {
double a = Md::log_generalized_factorial(1.0, i);
double b = lgamma(1.0 + i);
EXPECT_FLOAT_EQ(a,b);
}
double gf_3_6 = 3.0 * 4.0 * 5.0 * 6.0 * 7.0 * 8.0;
EXPECT_FLOAT_EQ(Md::log_generalized_factorial(3.0, 6.0), std::log(gf_3_6));
double gf_314_6 = 3.14 * 4.14 * 5.14 * 6.14 * 7.14 * 8.14;
EXPECT_FLOAT_EQ(Md::log_generalized_factorial(3.14, 6.0), std::log(gf_314_6));
}
int main(int argc, char** argv) {
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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