6-42.m

来自「MATLAB科学计算与工程分析源代码源程序5」· M 代码 · 共 8 行

clear
syms x y z
f=x^2+2*y^2+3*z^2+x*y;
v=[x,y,z];
j=jacobian(f,v);
j1=subs(subs(subs(j,x,0),y,0),z,0);
j2= subs(subs(subs(j,x,1),y,3),z,4)