Matlab繪圖示例

matlab下繪圖的簡單示例

示例一（用plot同時繪制兩條曲線）

x=0:0.01:2*pi
plot(x,sin(x),'green')
hold on
plot(x,sin(2*x),'red')

示例二（用stem繪制多個序列）

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（從復(fù)平面看幅頻特性）

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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