Minimal testcase:
sage: h(x) = floor(x)
sage: h(pi)._numerical_approx()
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-76-e2c08591fe0c> in <module>()
----> 1 h(pi)._numerical_approx()
/home/vbraun/Code/sage.git/src/sage/symbolic/expression.pyx in
sage.symbolic.expression.Expression._numerical_approx
(build/cythonized/sage/symbolic/expression.cpp:27487)()
4888 # in pynac
4889 if is_a_numeric(x._gobj):
-> 4890 res = py_object_from_numeric(x._gobj)
4891 elif is_a_constant(x._gobj):
4892 res = x.pyobject()
TypeError: cannot evaluate symbolic expression numerically
On Monday, March 30, 2015 at 6:46:08 AM UTC+2, William wrote:
>
> Hi,
>
> If I type
>
> sage: N(sqrt(floor(80000000000*pi) - 1))
>
> I get a number as expected.
>
> If I type
>
> sage: h(x) = (floor(8*pi*10^x)-1)^(1/2)
> sage: a = h(10); a
> sqrt(floor(80000000000*pi) - 1)
>
> that seems fine. But if I then do
>
> sage: N(a)
> Traceback:
> File
> "/usr/local/sage/sage-6.5/local/lib/python2.7/site-packages/sage/misc/functional.py",
>
>
> line 1298, in numerical_approx return x._numerical_approx(prec,
> algorithm=algorithm) File "sage/symbolic/expression.pyx", line 4874,
> in sage.symbolic.expression.Expression._numerical_approx
> (build/cythonized/sage/symbolic/expression.cpp:27342)
> raise TypeError("cannot evaluate symbolic expression numerically")
>
>
> Any idea what is going on here?
>
>
> -- william
>
>
> --
> William (http://wstein.org)
>
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