东华大学matlab数学实验-第四次答案(5)

0.5265 0.5079

f =

1.0e-09 *

-0.2859 -0.4618

h =

1

>>

9(1)

clear;

>> xa=-2:1;ya=-7:1;

>> [x,y]=meshgrid(xa,ya);

>> z=y.^3/9+3*x.^2.*y+9*x.^2+y.^2+x.*y+9;

>> mesh(x,y,z)