Hi again,
I have looked into my problem further, and it seems that the latex
command is at fault. As you see, only when I multiply the fraction by
-2 (or anything other than -1), do I get a negative fraction back from
the latex command.
Any ideas? Bug report? SAGE seems a very useful tool but if there are
problems like this lurking in the depths it is not yet safe for use.
sage: var('a,b')
(a, b)
sage: latex(-a/sqrt(b))
\frac{a}{\sqrt{b}}
sage: latex(-1*a/sqrt(b))
\frac{a}{\sqrt{b}}
sage: latex(-2*a/sqrt(b))
\frac{-2 \, a}{\sqrt{b}}
On Jul 8, 4:41 pm, Ra Cleave <[email protected]> wrote:
> Hi,
>
> I am new to SAGE, and would like some help with an error I have when using
> sagetex. When I paste commands from my latex source at the SAGE prompt, I get
> the correct results. When I use sagetex I get something different.
>
> The output from the SAGE prompt is copied below, and the PDF output from
> sagetex is attached (hope it is ok to attach PDFs). The signs in F2 are
> different. I have checked the .sage file that is generated, and it looks
> correct.
>
> My question is: What am I doing wrong??
>
> Thanks in advance,
> Ra
>
> ----------------------------------------------------------------------
> | Sage Version 4.4.4, Release Date: 2010-06-23 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: var('v,B_s,H_C')
> (v, B_s, H_C)
> sage: var('Q_R')
> Q_R
> sage: Q = v*Q_R
> sage: H = H_C-B_s*Q
> sage: n_1 = 1/(v*sqrt(H))
> sage: q_1 = 1/sqrt(H)
> sage: var('agv,A_0,A_1,A_2')
> (agv, A_0, A_1, A_2)
> sage: F1 = -n_1-agv-q_1
> sage: F2 = -A_1*n_1-agv-A_2*q_1
> sage: F1
> -agv - 1/sqrt(-B_s*Q_R*v + H_C) - 1/(sqrt(-B_s*Q_R*v + H_C)*v)
> sage: F2
> -agv - A_2/sqrt(-B_s*Q_R*v + H_C) - A_1/(sqrt(-B_s*Q_R*v + H_C)*v)
> sage:
>
> SageError.pdf
> 98KViewDownload
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