7-28  ʹjacobianԪĵ
⣺Enterȷϡ
>> syms x y z 
>> a=[x^2+x*y;sin(x)*cos(y)]
a =
[       x^2+x*y]
[ sin(x)*cos(y)]
>> jacobian(a,[x,y])
ans =
[    2*x+y,              x]
[  cos(x)*cos(y), -sin(x)*sin(y)]
>>
