Hi Alex,
> If I understand correctly your question, you would like to
> convert arithmetical expressions directly into Latex.
I would like to convert a string into a sage-Latex-expression (in
sagetex).
> I don't know if it is possible to do it in Sage, but you could
> always write your own function. I've written a small one that
> should do the trick.
[...]
> sage: sarrus(matrix)
> '[1 \\cdot 0 \\cdot 1 + 1 \\cdot (-1) \\cdot (-1) + 1 \\cdot 1
> \\cdot 0] - [1 \\cdot 0 \\cdot (-1) + 1 \\cdot 1 \\cdot 1 + 1
> \\cdot (-1) \ \cdot 0]'
> sage: print sarrus(matrix)
> [1 \cdot 0 \cdot 1 + 1 \cdot (-1) \cdot (-1) + 1 \cdot 1 \cdot 0]
> - [1 \cdot 0 \cdot (-1) + 1 \cdot 1 \cdot 1 + 1 \cdot (-1) \cdot
> 0]
>
> Does that answer your problem ?
Thank you for the code (it's more elegant than my first try :) ). It
doesn't work too, because the problem is that sagetex is putting the
string in some kind of (typewriter-)enviroment. After some
experimentation i found a possible solution is to replace "\cdot"
with "$\cdot$". It doesn't look nice, but better than before.
Georg
> On 5 mai, 11:28, "Dr. Georg Damm" <georg.d...@web.de> wrote:
> > Hi all,
> >
> > i've written a function to explain the rule of sarrus. Is there
> > a possibility to return latex code insted of a text? I'd like
> > to use something like $\sage{sarrus(A)}$ in sagetex.
> >
> > Thanks a lot,
> >
> > Georg
> >
> > P.S.: I expirimented with JSMathExpr from sage.misc.latex, but
> > i couldn't improve the output.
> >
> > def sarrus(A):
> > res=""
> > for i in range(3):
> >
> > if (A[0,i]>=0):
> > res+="+"+latex(A[0,i])
> > else:
> > res+="+("+latex(A[0,i])+")"
> > if (A[1,(i+1)%3]>=0):
> > res+="*"+latex(A[1,(i+1)%3])
> > else:
> > res+="*("+latex(A[1,(i+1)%3])+")"
> > if (A[2,(i+2)%3]>=0):
> > res+="*"+latex(A[2,(i+2)%3])
> > else:
> > res+="*("+latex(A[2,(i+2)%3])+")"
> >
> > for i in range(2,5):
> > if (A[0,i%3]>=0):
> > res+="-"+latex(A[0,i%3])
> > else:
> > res+="-("+latex(A[0,i%3])+")"
> > if (A[1,(i-1)%3] >= 0):
> > res+="*"+latex(A[1,(i-1)%3])
> > else:
> > res+="*("+latex(A[1,(i-1)%3])+")"
> > if (A[2,(i-2)%3]>=0):
> > res+="*"+latex(A[2,(i-2)%3])
> > else:
> > res+="*("+latex(A[2,(i-2)%3])+")"
> > return res
> >
> > --
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