quiver531.m

来自「from start to grasp the matlab」· M 代码 · 共 10 行

function quiver531

figure(1)
[X,Y] = meshgrid(-2:.2:2);
Z = X.*exp(-X.^2 - Y.^2);
[DX,DY] = gradient(Z,.2,.2);
contour(X,Y,Z)
hold on
quiver(X,Y,DX,DY)