@Dan, thanks a lot! That solves my problem.
On Saturday, December 15, 2012 1:05:49 PM UTC-8, Dan Drake wrote:
>
> On Sat, 15 Dec 2012 at 10:55AM -0800, pong wrote:
> > Hi Dan my intention is to generate tests using sagetex and sage. So I
> will
> > have something like
> >
> > m = 'undefined' if denom==0 else (y2-y1)/(x2-x1)
> >
> > .....
> >
> > then print out m at some point. So $\sage{m}$ does not work is denom==0
> > but \sagestr{m} doesn't seem to work if denom<>0.
> > Any suggestion?
>
> You'll have to push the "use $ or not" decision to the Sage level. Try
> something like this:
>
>
> \begin{sagesilent}
> def f(x, y):
> if y == 0:
> return 'undefined'
> else:
> return '${0}$'.format(latex(x/y))
> \end{sagesilent}
>
> abc \sagestr{f(1, 2)} def \sagestr{f(1, 0)} ghi
>
> That may be a little unsatisfying, but it should work. You could also
> make your typing a little easier with something like
>
> \newcommand{\foo}[2]{\sagestr{f(#1,#2)}}
>
> (With "foo" and "f" changed to something meaningful.) Then you do
> \foo{1}{2} in your document and it's easier to understand.
>
> Dan
>
> --
> --- Dan Drake
> ----- http://math.pugetsound.edu/~ddrake
> -------
>
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