torsten
77c67c12ca
Entire-Metadata: .entire/metadata/fb87247f-2a75-407e-b336-cbc8c20ba5a6 Entire-Session: fb87247f-2a75-407e-b336-cbc8c20ba5a6 Entire-Strategy: manual-commit
33 lines
964 B
C++
33 lines
964 B
C++
// Example of using the GeographicLib::TrigfunExt class.
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#include <iostream>
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#include <iomanip>
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#include <exception>
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#include <GeographicLib/Trigfun.hpp>
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#include <GeographicLib/EllipticFunction.hpp>
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using namespace std;
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using namespace GeographicLib;
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int main(int argc, const char* const argv[]) {
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try {
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// Integrate 1/sqrt(1 - k2*sin(x)^2) and compare this to the elliptic
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// integral of the first kine.
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double k2 = Math::sq(0.8);
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auto f = [k2] (double x) -> double
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{ return 1/sqrt(1 - k2 * Math::sq(sin(x))); };
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TrigfunExt tfe(f, Math::pi()/2);
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cout << "Number of coefficients: " << tfe.NCoeffs() << "\n";
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EllipticFunction ell(k2);
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cout << "x tf(x) tf(x)-F(x)\n";
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for (int i = 0; i <= 20; ++i) {
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double x = i/10.0;
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cout << x << " " << tfe(x) << " " << tfe(x) - ell.F(x) << "\n";
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}
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}
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catch (const std::exception& e) {
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std::cerr << "Caught exception: " << e.what() << "\n";
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return 1;
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}
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}
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