用Matlab闡述物理中的胡克定律，為彈簧振子震動的matlab動畫示意圖，另有一個為不同質(zhì)量不同彈簧系數(shù)的比較。spring.m,compare.m

rectangle('position',[12,8.5,2,0.3],'FaceColor',[0.5,0.3,0.4]); axis([0,15,-1,10]); hold on plot([13,13],[7,8.5],'r','linewidth',2); y=2:.2:7; M=length(y); x=12+mod(1:M,2)*2; x(1)=13; x(end-3:end)=13; D=plot(x,y); C=0:.1:2*pi; r=0.35; t1=r*sin(C); F1=fill(13+r*cos(C),2+t1,'r'); set(gca,'ytick',[0:2:9]); set(gca,'yticklabels',num2str([-1:3]')); plot([0,15],[3.3,3.3],'black'); H1=plot([0,13],[3.3,3.3],'y'); Q=plot(0,3.8,'color','r'); td=[]; yd=[]; T=0; text(2,9,'F=-kx','fontsize',16); set(gcf,'doublebuffer','on'); while T<12; pause(0.2); Dy=(3/2-1/2*sin(pi*T))*1/2;Y=-(y-2)*Dy+7; Yf=Y(end)+t1; td=[td,T];yd=[yd,Y(end)];set(D,'ydata',Y);set(F1,'ydata',Yf,'facecolor',rand(1,3));set(H1,'xdata',[T,13],'ydata',[Y(end),Y(end)]); set(Q,'xdata',td,'ydata',yd) ; T=T+0.1;drawnow; end

rectangle('position',[9,8.5,2,0.3],'FaceColor',[0.1,0.3,0.4]); axis([0,15,-1,10]); hold on plot([10,10],[7,8.5],'r','linewidth',2); y=4:.13:9; M=length(y); x=9+mod(1:M,2)*2; x(1)=10; x(end-6:end)=10; D=plot(x,y); C=0:.1:2*pi; r=0.5; t1=r*sin(C); F1=fill(10+r*cos(C),2+t1,'r'); set(gca,'ytick',[0:2:9]); set(gca,'yticklabels',num2str([-1:3]')); plot([0,12],[3.3,3.3],'black'); H1=plot([0,10],[3.3,3.3],'b'); w=plot(0,3.8,'color','g'); td=[]; yd=[]; T=0; text(2,9,'F=-kx','fontsize',16); set(gcf,'doublebuffer','on'); while T<12; pause(0.2); Dy=(1/2-1/3*sin(pi*T))*3/2;Y=-(y-4)*Dy+7; Yf=Y(end)+t1; td=[td,T];yd=[yd,Y(end)];set(D,'ydata',Y);set(F1,'ydata',Yf,'Facecolor',rand(1,3));set(H1,'xdata',[T,10],'ydata',[Y(end),Y(end)]); set(w,'xdata',td,'ydata',yd) ; T=T+0.1;drawnow; end

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