Strike a+ B* i of the phase angle of the procedures for phase spectrum into a gr...

代码说明：

求取a+b*i的相位角的程序，用于相位谱成图显示，问题关键在于根据a,b的值判断相位角所在的象限-Strike a+ B* i of the phase angle of the procedures for phase spectrum into a graph shows, the problem lies in the basis of a, b values to determine where the phase angle quadrant