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?
On Saturday, December 15, 2012 10:09:20 AM UTC-8, Dan Drake wrote:
>
> On Sat, 15 Dec 2012 at 02:45AM -0800, pong wrote:
> > I am having the same trouble as John. Would you expand a little bit on
> your
> > solution:
> >
> > for example
> > $\sage{'Hello'}$
> > causes an error. Where should I put the 'r' as suggested in your post (I
> > think stands for raw string)? I tried several combination but nothing
> seems
> > to work.
>
> It causes an error because the \sage{} macro runs Sage's latex()
> function on its argument, which in this case produces "\verb|Hello|".
> Then TeX gets unhappy because of the verbatim text inside a math
> environment.
>
> If you just want the string 'Hello' inserted into your document, use
> \sagestr{}. Or, don't surround \sage{} with dollar signs.
>
> > > SAGE should not read Python escape codes inside $'s. As you've
> > > noticed from the error message, SAGE doesn't even know it's still
> > > doing it. It thinks it's parsing LaTeX.
>
> There is no (easy/reasonable) way for SageTeX to detect whether \sage{}
> was called within a math environment, and in any case, altering Sage's
> behavior with respect to Python string conventions would require a lot
> of work in the preparser that (1) would be difficult, and (2) represent
> a large deviation from standard Python behavior that almost no one would
> think is reasonable. (That's what I think, at any rate...)
>
> Also, as was pointed out, you can use raw strings to avoid that
> behavior. TeX is completely oblivious to the difference between
> \sage{r"\nabla"} and \sage{"\nabla"}, so you can always use the former
> to get your intended behavior.
>
> Dan
>
> --
> --- Dan Drake
> ----- http://math.pugetsound.edu/~ddrake
> -------
>
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