You can pass the whole expression as a string to sympify(rational=True),
like
sympify('Matrix([[0.8, 0.2], [0.6, 0.4]])', rational=True)
You can also use nsimplify() on the expression after it is created, but
this may result in different numbers in some cases because of the
inexactness of floating point numbers.
Aaron Meurer
On Tue, Apr 11, 2017 at 12:52 PM, chaowen guo <[email protected]> wrote:
> Hi:
>
> I want to create a sympy matrix from string floating and I want to get
> exact values not just floating point, so I have to specify sympy.Rational
> every time as follows:
>
>
>
> I want to ask is there any easier way to specify sympy.Rational only once,
> maybe something like dtype in numpy? say:
> sympy.Matrix([['0.8','0.2'],['0.6','0.4']],dtype=sympy.Rational)
>
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