AttributeError: 'ImmutableDenseNDimArray' object has no attribute '_eval_evalf'

This error occurs when you try to evaluate a Sympy expression that contains an ImmutableDenseNDimArray object using the evalf() method, which is not defined for ImmutableDenseNDimArray.

To resolve this error, you can convert the ImmutableDenseNDimArray object to a Sympy expression using the sympy.Matrix() function, and then evaluate the expression using the evalf() method.

For example:

import sympy as sp

# create an ImmutableDenseNDimArray object
arr = sp.ImmutableDenseNDimArray([1, 2, 3])

# convert to a Sympy matrix
mat = sp.Matrix(arr)

# evaluate the matrix using evalf()
mat.evalf()

This should give you the evaluated matrix as a Sympy expression.

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