[pstricks] Plotting Numeric Values Against Dates

[Rich Shepard]

On Mon, 14 Jun 2010, Rich Shepard wrote:

>  I see my error in directly adapting bar0-3.tex as a template for my data.
> However, reading the pst-plot doc doesn't make clear to me what function to
> use instead of \listplot when the abscissa values are dates rather than
> numbers.

   Progress, of a sort. :-)

   The listing is:

\documentclass{article}
\pagestyle{empty}
\setlength\parindent{0pt}
\usepackage{pstricks,pst-plot}

\begin{document}

\psset{xunit=.4cm,yunit=.3cm}

\begin{pspicture}(-2.25,-2)(29,12)
   \readdata{\data}{precip1.dat}%
   \psset{llx=-0.5cm,lly=-0.75cm,plotstyle=LineToXAxis}
   \pstScalePoints(1,1){1989 sub}{3 sub}
   \begin{psgraph}[axesstyle=frame,Dx=2,Ox=01-Dec-2008,Oy=2,subticks=2](0,0)(12,4){6in}{3in}
     \listplot[linecolor=red,linewidth=12pt]{\data}
   \end{psgraph}

   \rput{90}(-3,6.25){Precipitation (in.)}
\end{pspicture}

\end{document}

   I get an error for line 16 (the \begin{psgraph}... line):

(/usr/share/texmf/tex/generic/multido/multido.tex  v1.42, 2010/05/14 <tvz>)
  v1.16, 2010/05/14)) (./precip.aux)
! Missing = inserted for \ifnum.
<to be read again>
                    -
l.16 ...2008,Oy=2,subticks=2](0,0)(12,4){6in}{3in}

   When I look in the pst-plot doc (page 26) where the psaxes options are
supposed to be explained, I find only the polar option. What does the frame
option do? I'm trying to learn where I've made the error but the doc isn't
helping me.

   The data file (precip1.dat) is attached.

Thanks,

Rich
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