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 ]
On Tuesday, 28 July 2015 21:31:07 UTC+2, Jonathan Crall wrote:
>
> 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?
>
>
>
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