untitled4.asv

来自「《MATLAB 7.0编程基础》第3章 （源码实例）主要讲解MATLAB的数值计」· ASV 代码 · 共 12 行

clear all;
[X,Y] = meshgrid(-2:.02:2);
%Z = X.*exp(-X.^2 - Y.^2);
Z =X.^2+3*Y.^2-1;
[DX,DY] = gradient(Z,.02,.02);
contour(X,Y,Z)
hold on
quiver(X,Y,DX,DY)
colormap hsv
%plot(X,Y,Z,'--rs','LineWidth',2,'MarkerEdgeColor','k','MarkerFaceColor','g
%','MarkerSize',10);
hold off