用angle求y=sin(100*pi*t)相位角时遇到了困难

有没有考虑相位解缠(unwrap)啊

把帮助给你看看，你应该就清楚了：
P = angle(Z) returns the phase angles, in radians, for each element of complex array Z. The angles lie between . For complex Z, the magnitude R and phase angle theta are given by R = abs(Z)
theta = angle(Z)
and the statement Z = R.*exp(i*theta)
converts back to the original complex Z.