µ±Ç°Î»ÖãºÊ×Ò³ > Á¬ÐøÊ±¼äÐźźÍϵͳʱÓò·ÖÎö¼°MATLABʵÏÖ
MatlabÓ¦ÓÃʵ¼ù¿Î³ÌÉè¼Æ
subplot(212); ezplot(y1); µ¹Ïà clc; t=0:0.0001:2; y=sin(2*pi*t); y1=-y; subplot(211); plot(t,y);
axis([0 2 -1.5 1.5]); subplot(212); plot(t,y1); axis([0 2 -1.5 1.5]); ×ۺϱ仯 clc£» syms t;
f=sym('sin(t)/t'); %¶¨Òå·ûºÅº¯Êýf(t)=sin(t)/t f1=subs(f,t,t+3); %¶Ôf½øÐÐÒÆÎ» f2=subs(f1,t,2*t); %¶Ôf1½øÐг߶ȱ任 f3=subs(f2,t,-t); %¶Ôf2½øÐз´ñÞ subplot(2,2,1);ezplot(f,[-8,8]);grid on; subplot(2,2,2);ezplot(f1,[-8,8]);grid on; subplot(2,2,3);ezplot(f2,[-8,8]);grid on; subplot(2,2,4);ezplot(f3,[-8,8]);grid on;
½»Ö±Á÷·Ö½â
clc;
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MatlabÓ¦ÓÃʵ¼ù¿Î³ÌÉè¼Æ
t=-1:0.001:1; f=sin(2*pi*t)+2; g=mean(f); h=f-g; subplot(311); plot(t,f);
axis([-1 1 0.5 3.5]); subplot(312); plot(t,g);
axis([-1 1 1.5 2.5]); subplot(313); plot(t,h);
axis([-1 1 -1.5 1.5]);
ÆæÅ¼·Ö½â
clc; syms t;
f=sym('sin(t- 0.1)+t '); f1=subs(f,t,-t) g=1/2*(f+f1); h=1/2*(f-f1); subplot(311); ezplot(f,[-8,8]); subplot(312); ezplot(g,[-8,8]); subplot(313); ezplot(h,[-8,8]);
¾í»ý
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MatlabÓ¦ÓÃʵ¼ù¿Î³ÌÉè¼Æ
function [f,k]=sconv(f1,f2,k1,k2,p) %¼ÆËãÁ¬ÐøÐźží»ý»ý·Ö f(t)=f1(t)*f2(t) % f: ¾í»ý»ý·Ö f(t)¶ÔÓ¦µÄ·ÇÁãÑùÖµÏòÁ¿ % k£ºf(t)µÄ¶ÔӦʱ¼äÏòÁ¿ % f1: f1(t)·ÇÁãÑùÖµÏòÁ¿ % f2: f2(t)µÄ·ÇÁãÑùÖµÏòÁ¿ % k1: f1(t)µÄ¶ÔӦʱ¼äÏòÁ¿ % k2: f2(t)µÄ¶ÔӦʱ¼äÏòÁ¿ % p£ºÈ¡Ñùʱ¼ä¼ä¸ô
f=conv(f1,f2); %¼ÆËãÐòÁÐ f1 Óë f2 µÄ¾í»ýºÍ f f=f*p;
k0=k1(1)+k2(1); %¼ÆËãÐòÁÐ f ·ÇÁãÑùÖµµÄÆðµãλÖà k3=length(f1)+length(f2)-2; %¼ÆËã¾í»ýºÍ f µÄ·ÇÁãÑùÖµµÄ¿í¶È
k=k0:p:k3*p; %È·¶¨¾í»ýºÍ f ·ÇÁãÑùÖµµÄʱ¼äÏòÁ¿ subplot(2,2,1)
plot(k1,f1) %ÔÚ×Óͼ 1 »æ f1(t)ʱÓò²¨ÐÎͼ title('f1(t)') xlabel('t') ylabel('f1(t)') subplot(2,2,2)
plot(k2,f2) %ÔÚ×Óͼ 2 »æ f2(t)ʱ²¨ÐÎͼ title('f2(t)') xlabel('t') ylabel('f2(t)') subplot(2,2,3)
plot(k,f); %»¾í»ý f(t)µÄʱÓò²¨ÐÎ h=get(gca,'position'); h(3)=2.5*h(3);
set(gca,'position',h) %½«µÚÈý¸ö×ÓͼµÄºá×ø±ê·¶Î§À©ÎªÔÀ´µÄ 2.5 ±¶
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MatlabÓ¦ÓÃʵ¼ù¿Î³ÌÉè¼Æ
title('f(t)=f1(t)*f2(t)') xlabel('t') ylabel('f(t)')
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