数学实验与 Matlab if(m~=0) u(1)=(xy(k(),1)-xy(i,1))v(1)=(xy(k(j),2)-xy(i,2)) u(2)=ep X=[[xy(i,1)xy(k(j),1)]X],Y=[xy(i,2)xy(k(j),2)]:Y text(xy(i, 1),xy (i, 2),'\bullet\leftarrowlfontsize( 16)itV) m2str(i)]): hold gplot(A, xy), axis([a bc d)), hold on h=quiver(x,Y, U, V, p); set(h, color,red); hold o plot(xy (: 1), xy(: 2), k !,markersize, 12), hold end hold off 实验2.函数的可视化与 Matlab作 21实验与观察:函数的可视化 211 Matlab二维绘图命令 1周期函数与线性p一周期函数 观察 r clf, x-linspace(0, 8*pi, 100) F=inline(sin(x+cos(x+sin(x)))) yI=sin(x+cos(x+sin(x))): y2=0.2*x+sin(x+cos(x+sin(x))) plot(x,y1, ' k:,x,y2, k-) legend(sin(x+cos(x+sin(x)), 0.2x+sin (x+cos(x+sin(x))), 2))数学实验与 Matlab 7 7 if(m~=0) for j=1:m u(1)=(xy(k(j),1)-xy(i,1)); v(1)=(xy(k(j),2)-xy(i,2)); u(2)=eps; v(2)=eps; U=[u;U];V=[v;V]; X=[[xy(i,1) xy(k(j),1)];X]; Y=[[xy(i,2) xy(k(j),2)];Y]; end text(xy(i,1),xy(i,2),['\bullet\leftarrow\fontsize{16}\it{V}',… um2str(i)]); hold on, end end gplot(A,xy),axis([a b c d]),hold on, h=quiver(X,Y,U,V,p);set(h,'color','red');hold on, plot(xy(:,1),xy(:,2),'k.','markersize', 12),hold on, end , hold off 】 实验２．函数的可视化与 Matlab 作 2.1 实验与观察：函数的可视化 2.1.1Matlab 二维绘图命令 1.周期函数与线性 p－周期函数 ◆ 观察 ： 【 clf, x=linspace(0,8* pi,100); F=inline('sin(x+cos(x+sin(x)))'); y1=sin(x+cos(x+sin(x))); y2=0.2* x+sin(x+cos(x+sin(x))); plot(x,y1,'k:',x,y2,'k-') legend('sin(x+cos(x+sin(x))','0.2x+sin(x+cos(x+sin(x)))',2) 】