example_quiver.m

基础程序

% example_quiver.m
% 绘制矢量图
[X,Y]=meshgrid(-2:.2:2);
Z=X.*exp(-X.^2 - Y.^2+1);
% 得到X，Y位置处的向量
[DX,DY]=gradient(Z,.2,.2);
% 绘制等值线图
contour(X,Y,Z)
hold on
% 叠加矢量分布图
quiver(X,Y,DX,DY)
colormap hsv
hold off
title('figure: vector and contour')