matlab下绘图的简单示例
时间:10-02
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matlab下绘图的简单示例 示例一(用plot同时绘制两条曲线) x=0:0.01:2*pi plot(x,sin(x),'green') hold on plot(x,sin(2*x),'red') 示例二(用stem绘制多个序列) n=0:50; A=444.128; a=50*sqrt(2.0)*pi; T=0.001; w0=50*sqrt(2.0)*pi; x=444.128*exp(-a*n*T).*sin(w0*n*T); X=fft(x); % Draw x,abs(X),angle(X) hold on stem(x) stem(abs(X),'fill','r-.') stem(angle(X),'fill','g-.') 示例三(从复平面看幅频特性) th = (0:127)/128*2*pi; x = cos(th); y = sin(th); f = abs(fft(ones(10,1),128)); stem3(x,y,f','d','fill') view([-65 30]) xlabel('Real') ylabel('Imaginary') zlabel('Amplitude') title('Magnitude Frequency Response') rotate3d on
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