7-21  㡣
⣺Enterȷϡ
>> q=sym('[3,4,9,6;x,y,z,w;a,b,c,d]')
q =
[ 3, 4, 9, 6]
[ x, y, z, w]
[ a, b, c, d]
>> p=sym('[x,1/x,x^2,x^3;a,b,c,d;5,2,3,6]')
p =
[   x, 1/x, x^2, x^3]
[   a,   b,   c,   d]
[   5,   2,   3,   6]
>> r=q*p
??? Error using ==> sym/mtimes
Inner matrix dimensions must agree.
>>
