Is there a way to trick SageMath into presenting numeric approximations
with symbolics? In this specific case, handling numbers with units attached.
For example:
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 8.1, Release Date: 2017-12-07 │
│ Type "notebook()" for the browser-based notebook interface. │
│ Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
sage: cm = units.length.centimeter;
sage: x = 1e-6*cm;
sage: x
(1.00000000000000e-6)*centimeter
sage: x.n(digits=2)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-4-3595ea137553> in <module>()
----> 1 x.n(digits=Integer(2))
/home/Scratch/Install/Linux/SageMath/sage-8.1-Fedora_26-x86_64/SageMath/src/
sage/structure/element.pyx in sage.structure.element.Element.n (build/
cythonized/sage/structure/element.c:8063)()
861 0.666666666666667
862 """
--> 863 return self.numerical_approx(prec, digits, algorithm)
864
865 N = deprecated_function_alias(13055, n)
/home/Scratch/Install/Linux/SageMath/sage-8.1-Fedora_26-x86_64/SageMath/src/sage/symbolic/expression.pyx
in sage.symbolic.expression.Expression.numerical_approx
(build/cythonized/sage/symbolic/expression.cpp:36128)()
5782 res = x.pyobject()
5783 else:
-> 5784 raise TypeError("cannot evaluate symbolic expression
numerically")
5785
5786 # Important -- the we get might not be a valid output for
numerical_approx in
TypeError: cannot evaluate symbolic expression numerically
Thank you for any suggestions!
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