El Wed, 05 Oct 2011 18:40:04 +0200, Christian Feuersaenger
<cfeuersaen...@googlemail.com> vau escriure:
> Hi Ignasi,
>
> yes, that is possible since pgfplots 1.5 : use 'plot unprocessed to
> file={<file name>}':
>
Great! I'm using tlcontrib version and it worked.
As I explained in another message I wanted to plot some signal+noise plot
and
wanted to use same noise (random values) in several plots. Next you will
find the
example, in case anybody is interested in it.
Just a comment about 'plot unprocessed to file', because it's used within
addplot,
it produces an step in cycle list although nothing is drawn.
%-------------------
\documentclass[border=3mm]{standalone}
\usepackage{pgfplots}
\begin{document}
\pgfplotsset{
scale=0.5,
domain=0:2*pi,
samples=200,
every axis plot post/.append style={mark=none},
cycle list name=exotic,
axis y line=left,
axis x line=middle,
xmax=7,
ymin=-1.5,
ymax=1.5,
xtick=\empty,
ytick=\empty
}
\begin{tikzpicture}[baseline]
\begin{axis}[name=sin,anchor=center]
\addplot {0.7*sin(deg(x))};
\end{axis}
\end{tikzpicture}
$+$
\begin{tikzpicture}[baseline]
\begin{axis}[name=noise,anchor=center]
\addplot [plot unprocessed to file={awgn.dat}] {rand};
\addplot file {awgn.dat};
\end{axis}
\end{tikzpicture}
$=$
\begin{tikzpicture}[baseline]
\begin{axis}[name=total,anchor=center]
\pgfplotsset{cycle list shift=+3}
\addplot table[y expr=\thisrowno{1}+0.7*sin(deg(\thisrowno{0}))]
{awgn.dat};
\end{axis}
\end{tikzpicture}
\begin{tikzpicture}[baseline]
\begin{axis}[name=sin,anchor=center]
\addplot {0.7*sin(deg(x))};
\end{axis}
\end{tikzpicture}
$+$
\begin{tikzpicture}[baseline]
\begin{axis}[name=noise,anchor=center]
\pgfplotsset{cycle list shift=+1}
\addplot table[y expr=0.2*\thisrowno{1}] {awgn.dat};
\end{axis}
\end{tikzpicture}
$=$
\begin{tikzpicture}[baseline]
\begin{axis}[name=total,anchor=center]
\pgfplotsset{cycle list shift=+3}
\addplot table[y expr=0.2*\thisrowno{1}+0.7*sin(deg(\thisrowno{0}))]
{awgn.dat};
\end{axis}
\end{tikzpicture}
\end{document}
%----------------------
Thank you,
Ignasi
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