tikz plot problems

[Geoff Ostrin]

I have worked through some of the examples found in the tikz manual
and all works unitl I need to use "plot". Below is a minimal non-
working example simply copied from the manual. Perhaps I'm now missing
something in the preamble.

Any ideas?
Many thanks in advance,

Geoff.

\documentclass{article}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\draw plot (\x,\x);
\end{tikzpicture}

\end{document}

[Victor Ivrii]

pgf & tikz uses gnuplot to provide some data for a plot. So you need
1) to have gnuplot installed
2) run (pdf)latex with --shell-escape switch enabling \write18 to
summon gnuplot to provide this data.

You missing nothing in preamble

HTH

[Ken Starks]

It worked for me. (MikTeX distribution on windows)

I got a straight line at 45 degrees, length: 100mm x sqrt(2)

[Alain Matthes]

On 2008-08-16 17:13:50 +0200, Victor Ivrii <viv...@gmail.com> said:

>
> pgf & tikz uses gnuplot to provide some data for a plot. So you need
> 1) to have gnuplot installed
> 2) run (pdf)latex with --shell-escape switch enabling \write18 to
> summon gnuplot to provide this data.
>
> You missing nothing in preamble

Hi,

No pgf/tikz can plot with gnuplot or without it

\documentclass{article}
\usepackage{tikz}
\begin{document}

\begin{tikzpicture}%[domain=0:4]
\draw[color=red] plot (\x,\x) ;
\end{tikzpicture}
\end{document}

With this code, (see page 195 the pgfmanual) TikZ can
plot without gnuplot

with gnuplot the code is

\begin{tikzpicture}[domain=0:4]
\draw[color=red] plot[id=x] function{x} node[right] {$f(x) =x$};
\end{tikzpicture}

It's better to give a domain but initially the values of \x are between
-5 and 5

Best Regards

Alain

[Geoff Ostrin]

[Geoff Ostrin]

I might have just sent an empty reply, apologies.

I'm glad it worked straight up for you, that's what I was expecting
too. All previous copy/paste examples worked too. I am also using
MikTeX on windows.
-------------------------------------
The error is:
! Package tikz Error: Cannot parse this plotting data.

See the tikz package documentation for explanation.

l.9 \draw plot (
\x,\x);

--------------------------------------

So I still can't see what the problem is!

[Geoff Ostrin]

> So I still can't see what the problem is!

I realised, thanks to K.Starks message, that perhaps I needed to
update my Miktex. Lo and behold, it works.

Thanks for the help and time given, sorry for being an inconvenience.

Geoff.

[Ken Starks]

You're very welcome.

Ken