liti20.m

来自「数学建模与数学实验-14.4M-doc.zip」· M 代码 · 共 6 行

        [x,y,z]=peaks(20);
        [dx,dy]=gradient(z,.5,.5);
        contour(x,y,z,10)
        hold  on
        quiver(x,y,dx,dy)
        hold off