matlab 画电场线[x,y]=meshgrid(-2:0.1:2,-2:0.1:2);z=1./sqrt((x-1).^2+y.^2+0.01)+1./sqrt((x+1).^2+y.^2+0.01);[dx,dy]=gradient(z);contour(x,y,z,[-12,-8,-5,-3,-1,-0.5,-0.1,0.1,0.5,1,3,5,8,12]);hold onquiver(x,y,dx,dy);这样画出来全是小箭头,

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matlab 画电场线[x,y]=meshgrid(-2:0.1:2,-2:0.1:2);z=1./sqrt((x-1).^2+y.^2+0.01)+1./sqrt((x+1).^2+y.^2+0.01);[dx,dy]=gradient(z);contour(x,y,z,[-12,-8,-5,-3,-1,-0.5,-0.1,0.1,0.5,1,3,5,8,12]);hold onquiver(x,y,dx,dy);这样画出来全是小箭头,
matlab 画电场线
[x,y]=meshgrid(-2:0.1:2,-2:0.1:2);
z=1./sqrt((x-1).^2+y.^2+0.01)+1./sqrt((x+1).^2+y.^2+0.01);
[dx,dy]=gradient(z);
contour(x,y,z,[-12,-8,-5,-3,-1,-0.5,-0.1,0.1,0.5,1,3,5,8,12]);
hold on
quiver(x,y,dx,dy);
这样画出来全是小箭头,效果不好,怎么才能是一根根的线啊

matlab 画电场线[x,y]=meshgrid(-2:0.1:2,-2:0.1:2);z=1./sqrt((x-1).^2+y.^2+0.01)+1./sqrt((x+1).^2+y.^2+0.01);[dx,dy]=gradient(z);contour(x,y,z,[-12,-8,-5,-3,-1,-0.5,-0.1,0.1,0.5,1,3,5,8,12]);hold onquiver(x,y,dx,dy);这样画出来全是小箭头,
[x,y]=meshgrid(-2:0.1:2,-2:0.1:2);
z=1./sqrt((x-1).^2+y.^2+0.01)+1./sqrt((x+1).^2+y.^2+0.01);
[dx,dy]=gradient(z);
contour(x,y,z,[-12,-8,-5,-3,-1,-0.5,-0.1,0.1,0.5,1,3,5,8,12]);
hold on
quiver(x,y,dx,dy);
xx=[linspace(-2,2,10),2*linspace(1,1,10),linspace(-2,2,10),-2*linspace(1,1,10),.01*linspace(1,1,10),-.01*linspace(1,1,10)];
yy=[2*linspace(1,1,10),linspace(-2,2,10),-2*linspace(1,1,10),linspace(-2,2,10),linspace(-2,2,10),linspace(-2,2,10)];
streamline(x,y,dx,dy,xx,yy)

怎么用matlab画函数图z=x*y/(x*x+y*y)如何用matlab画 如何用matlab画y=(1+1/x)^x matlab 画电场线[x,y]=meshgrid(-2:0.1:2,-2:0.1:2);z=1./sqrt((x-1).^2+y.^2+0.01)+1./sqrt((x+1).^2+y.^2+0.01);[dx,dy]=gradient(z);contour(x,y,z,[-12,-8,-5,-3,-1,-0.5,-0.1,0.1,0.5,1,3,5,8,12]);hold onquiver(x,y,dx,dy);这样画出来全是小箭头, matlab如何画z=x^2+y^2,z matlab公式“y=a.*(1-sin(x))”怎么画 matlab如何画y=4/x^2的图像? 如何用Matlab画y=5/(x^2+0.5) matlab 可以画y=1/x么 matlab中怎样画y=e^x的图像 如何用matlab画曲面Z=X*Y 已知平面内离散点（x,y）处的电位值u(x,y),但不知道电位函数表达式,能否用matlab画平面区域电场线,谢谢如果可以的话，用matlab程序如何实现。求指点，谢谢！ 用MATLAB 怎么 画 x = (y/4)*Sqrt[2 - y^2]用MATLAB 怎么画函数x = (y/4)*Sqrt[2 - y^2]的图. 求用matlab画三维 x^2+y^2+x*y-2=0图形 如何用MATLAB,画y=189/x的曲线图!X横坐标Y纵坐标 matlab画曲面(x^2+y^2)^2=x^2-y^2 Matlab怎么画这个图啊 z=(x^3+y^3)/(1/x+1/y) 2y=erfc+exp(0.1*x)*erfc用matlab画y关于x的图像 matlab画三维函数z=(x-2)(50-2x+y)-y^2-18 x>0 ,y>0用matlab怎么画出图像