On Fri, 16 Jan 2015 at 09:57AM -0800, Pedro Cruz wrote:
> An unexpected behaviour in latex() command (both 5.12 and 6.4 Sage
> versions):
>
> sage: latex( 120/factorial(5,hold=True) )
> \frac{120}{120}
> sage: latex( factorial(5,hold=True) )
> 5!
>
> We need to "hold" the expression for proper latex transcription.
>
> Is there any other way to avoid latex() to compute things?
I don't think so. My understanding is that this comes from the basic
semantics of Python; latex() will only see the integer 120, because
Python evaluates the factorial(). AFAIK there's just no concept of
"don't evaluate this yet" in Python, unless you use strings and eval().
In SageTeX, my experience is that this isn't as big a problem as you may
think. In your example, I would do something like
\begin{sagesilent}
n = 5
\end{sagesilent}
blah blah $120/\sage{n}! = 120/\sage{factorial(n)} =
\sage{120/factorial(n)}$.
Another option here is to use a symbolic variable:
\begin{sagesilent}
n = var('n')
\end{sagesilent}
blah blah $120/\sage{factorial(n)}$ which, when $n=5$, is
$\sage{120/factorial(n).subs(n=5)}$.
Dan
--
--- Dan Drake
----- www.math.wisc.edu/~ddrake/
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