Hi Sage,
I'm not sure if it's that I'm not doing this right, but I have this
function that has a ceiling in it. I defined it like so:
botrk(h0_prime, a0, s0, c0) = h0_prime / ceil(log(20 * (a0 + 25) / (h0_prime
+ 20 * (a0 + 25)), 0.95)) * (s0 + 0.4) * (1 + c0)
But it won't do approximations of the ceiling, only returning another
symbolic expression that can't be approximated.
sage: botrk(3000, 10, 1, 0.1)
4620.00000000000/ceil(-19.4957257462237*log(7/37))
sage: botrk(3000, 10, 1, 0.1).n()
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-63-503406e1b435> in <module>()
----> 1 botrk(Integer(3000), Integer(10), Integer(1), RealNumber('0.1')).n()
/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/symbolic/expression.so
in sage.symbolic.expression.Expression._numerical_approx
(sage/symbolic/expression.cpp:21011)()
TypeError: cannot evaluate symbolic expression numerically
Does anyone know how to approximate ceilings? For my purpose, I could just
plug this in again and get a result, but I was hoping for a better, cleaner
way of doing it.
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