Actually one can use as_explicit. I did not saw it in the
documentations, only when I checked the code I found about it.

On 11 March 2012 21:14, [email protected]
<[email protected]> wrote:
> n [8]: i = ImmutableMatrix(eye(3))
>
> In [9]: i**2
> Out[9]:
>
>         2
> ⎡1  0  0⎤
> ⎢         ⎥
> ⎢0  1  0⎥
> ⎢         ⎥
> ⎣0  0  1⎦
>
> In [10]: _.doit()
> TypeError
>
> Casting to Matrix does not work either. How to actually calculate the
> product with Immutable matrices?

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