my_constants.h

C++实现的FFT

//constants frequently used
//by Sun Yimin, 2007.1.23
#ifndef _MY_CONSTANTS_H
#define _MY_CONSTANTS_H  1
//constants
double const PI = 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679;
double const MIU_0 = 1.2566370614359172953850573533118011536788677597500423283899778369231265625144835994512139301368468271e-6;
double const EPSILON_0 = 8.8541878176203898505365630317107502606083701665994498081024171524053950954599821142852891607182008932e-12;
double const LIGHTSPEED = 3.0e8;
#endif