6-23  ʹjacobianԪĵ
>> syms x y z
>> jacobian([x*y*z; y; x+z],[x y z])
ans =
[ y*z, x*z, x*y]
[   0,   1,   0]
[   1,   0,   1]
>> syms u v 
>> jacobian(u*exp(v),[u;v])
ans =
[   exp(v), u*exp(v)]
>>
