How do you disable expression evaluation of matrix multiplication?

[Jonathan Crall]

I'm using sympy to generate some latex output, and I would like to create an expression by multiplying several matrices, but I don't want it to simply the expression. 

A simple example: 

I have 

x, y, ori = sympy.symbols('x y ori')

T = Matrix([

[1, 0, -x],

[0, 1, -y],

[0, 0,  1]])

R = Matrix([

[ cos(ori), sin(ori), 0],

[-sin(ori), cos(ori), 0],

[        0,        0, 1]])

A = R.multiply(T)

Currently sympy.latex(A) looks something like: 

[[ cos(ori), sin(ori), -x*cos(ori) - y*sin(ori)],

[-sin(ori), cos(ori),  x*sin(ori) - y*cos(ori)],

[        0,        0,                        1]])

But I would like something more like this: 

[[ cos(ori), sin(ori), 0],       [1, 0, -x],

 [-sin(ori), cos(ori), 0],       [0, 1, -y],

 [        0,        0, 1]])      *    [0, 0,  1]]

Is it possible to disable the automatic expression evaluation?

[Francesco Bonazzi]

Yes, it is. Type:

MatMul(R, T, hold=True)

In [1]: x, y, ori = symbols('x y ori')

In [2]: T = Matrix([
   ...: [1, 0, -x],
   ...: [0, 1, -y],
   ...: [0, 0,  1]])

In [3]: R = Matrix([
   ...: [ cos(ori), sin(ori), 0],
   ...: [-sin(ori), cos(ori), 0],
   ...: [        0,        0, 1]])

In [4]: MatMul(R, T, hold=True)
Out[4]:
[cos(ori)   sin(ori)  0]*[1  0  -x]
[                      ] [        ]
[-sin(ori)  cos(ori)  0] [0  1  -y]
[                      ] [        ]
[    0         0      1] [0  0  1 ]