非正弦周期信号的傅里叶级数展开式
标准信号的生成
方波：x1=square(2pi4t);
Duty cycle is 50%(default);Frequency is 4Hz
x2=square(2pi4t,75);Duty cycle is 75%;Frequency is 4Hz
三角波：x=sawtooth(2pi3t);
Peak at end of cycle(default);Frequency is 3Hz
x=sawtooth(2pi3t,1/2);
Peak half way through cycle;Frequency is 3Hz
