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matlab下绘图的简单示例
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示例一(用plot同时绘制两条曲线)) m6 n% m L# g4 m3 t
% P( B6 {9 ^, `x=0:0.01:2*pi- N8 I1 ^( ~6 ?4 j8 R J
plot(x,sin(x),'green')4 H; s+ P0 G6 Y: d( Y1 L. F
hold on3 m k! Y: ?* t) ]) C4 r) d
plot(x,sin(2*x),'red')- h* `; N# K3 Q+ n
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示例二(用stem绘制多个序列)2 ?5 {" W t; u
! c3 I1 S. ^5 }/ wn=0:50; # R, N) D2 a b- s: G; F o" D; @
A=444.128;
" G* k/ A- w; ?* C3 Ea=50*sqrt(2.0)*pi;
) V$ q" y9 k4 oT=0.001;
" n6 y& m$ |/ R; k5 ?w0=50*sqrt(2.0)*pi;7 Q* B, i0 g+ x! C# q' Y: H
x=444.128*exp(-a*n*T).*sin(w0*n*T);
9 _# K( O# @' m+ }& PX=fft(x);5 j- C$ l2 X4 n0 ^. Q9 ^' K. z- ]. [
% Draw x,abs(X),angle(X)1 N- r. j. ?4 R
hold on6 x, L; ^/ p; H( u o' S( P
stem(x)
3 ?1 K2 a% R; e' D! v! h) Qstem(abs(X),'fill','r-.'): A' N3 A4 l1 S5 V* ^
stem(angle(X),'fill','g-.')% k. l4 i8 W& @. e
- W1 Q1 u) M5 O8 P" B% C4 A示例三(从复平面看幅频特性)) R& x1 ?- C. g6 G
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th = (0:127)/128*2*pi;$ A& S- [- Y1 p3 K: F
x = cos(th);
& X* `& b# {4 P/ h6 cy = sin(th);" L) h s% @+ l3 t
f = abs(fft(ones(10,1),128));
( R9 f, u" X0 ~8 j6 ^7 m) Ustem3(x,y,f','d','fill')0 h: k" c% k: Q' p/ ~6 p# K/ @
view([-65 30])0 F' ?3 S+ P' P
xlabel('Real'); I, j% W. e4 d3 t
ylabel('Imaginary')
7 D6 K1 _ E5 x1 H8 V& d7 Ezlabel('Amplitude')- |" U. B0 w8 Z; ~- D2 d
TI tle('Magnitude Frequency Response') s6 u& p" @ K0 r2 h% s1 W+ X
rotate3d on7 y# F; ^6 R8 r4 U. s6 }5 f- Q+ @1 o
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