33 lines
772 B
C
33 lines
772 B
C
#include "lizfcm.test.h"
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double f(double x) { return x * x; }
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double f_prime(double x) { return 2 * x; }
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double H = 0.0001;
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double ACCEPTED_DERIVATIVE_ERROR = 0.0001;
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UTEST(derivative, central) {
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double a = 3.0;
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double expected = f_prime(a);
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double f_prime_x = central_derivative_at(&f, a, H);
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EXPECT_NEAR(expected, f_prime_x, ACCEPTED_DERIVATIVE_ERROR);
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}
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UTEST(derivative, forward) {
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double a = 3.0;
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double expected = f_prime(a);
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double f_prime_x = forward_derivative_at(&f, a, H);
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EXPECT_NEAR(expected, f_prime_x, ACCEPTED_DERIVATIVE_ERROR);
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}
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UTEST(derivative, backward) {
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double a = 3.0;
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double expected = f_prime(a);
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double f_prime_x = backward_derivative_at(&f, a, H);
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EXPECT_NEAR(expected, f_prime_x, ACCEPTED_DERIVATIVE_ERROR);
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}
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