Constants

The following constants are available:

Constant	Value	Comment
gammalib::pi	\(\pi\)
gammalib::twopi	\(2\pi\)
gammalib::fourpi	\(4\pi\)
gammalib::pihalf	\(\pi/2\)
gammalib::inv_pihalf	\((\pi/2)^{-1}\)
gammalib::inv_sqrt2pi	\((\sqrt{2\pi})^{-1}\)
gammalib::inv_sqrt4pi	\((\sqrt{4\pi})^{-1}\)
gammalib::pi2	\(\pi^2\)
gammalib::deg2rad	\(\pi/180\)	Multiplication converts degrees to radians
gammalib::rad2deg	\(180/\pi\)	Multiplication converts radians to degrees
gammalib::ln2	\(\log 2\)	Natural logarithm of 2
gammalib::ln10	\(\log 10\)	Natural logarithm of 10
gammalib::inv_ln2	\((\log 2)^{-1}\)
gammalib::inv_ln10	\((\log 10)^{-1}\)
gammalib::inv_loge	\((\log_{10}(\exp 1))^{-1}\)
gammalib::onethird	\(1/3\)
gammalib::twothird	\(2/3\)
gammalib::fourthird	\(4/3\)
gammalib::sqrt_onehalf	\(\sqrt{1/2}\)
gammalib::sqrt_pihalf	\(\sqrt{\pi/2}\)
gammalib::sqrt_two	\(\sqrt{2}\);
gammalib::sqrt_twopi	\(\sqrt{2\pi}\)