Grazie per i tuoi commenti. Ho provato con epslatex ma non riesco proprio a farlo andare.
In gnuplot scrivo:
`set terminal epslatex color
set output 'gogo.tex'
f(x)=4*x
plot f(x)
set title “ciao $x=f_d\cdot 5$”
replot`
Ottengo il file gogo.tex e gogo.eps
`% GNUPLOT: LaTeX picture with Postscript
\begingroup
\makeatletter
\providecommand\color[2][]{%
\GenericError{(gnuplot) \space\space\space\@spaces}{%
Package color not loaded in conjunction with
terminal option `colourtext'%
}{See the gnuplot documentation for explanation.%
}{Either use 'blacktext' in gnuplot or load the package
color.sty in LaTeX.}%
\renewcommand\color[2][]{}%
}%
\providecommand\includegraphics[2][]{%
\GenericError{(gnuplot) \space\space\space\@spaces}{%
Package graphicx or graphics not loaded%
}{See the gnuplot documentation for explanation.%
}{The gnuplot epslatex terminal needs graphicx.sty or graphics.sty.}%
\renewcommand\includegraphics[2][]{}%
}%
\providecommand\rotatebox[2]{#2}%
\@ifundefined{ifGPcolor}{%
\newif\ifGPcolor
\GPcolortrue
}{}%
\@ifundefined{ifGPblacktext}{%
\newif\ifGPblacktext
\GPblacktexttrue
}{}%
% define a \g@addto@macro without @ in the name:
\let\gplgaddtomacro\g@addto@macro
% define empty templates for all commands taking text:
\gdef\gplbacktext{}%
\gdef\gplfronttext{}%
\makeatother
\ifGPblacktext
% no textcolor at all
\def\colorrgb#1{}%
\def\colorgray#1{}%
\else
% gray or color?
\ifGPcolor
\def\colorrgb#1{\color[rgb]{#1}}%
\def\colorgray#1{\color[gray]{#1}}%
\expandafter\def\csname LTw\endcsname{\color{white}}%
\expandafter\def\csname LTb\endcsname{\color{black}}%
\expandafter\def\csname LTa\endcsname{\color{black}}%
\expandafter\def\csname LT0\endcsname{\color[rgb]{1,0,0}}%
\expandafter\def\csname LT1\endcsname{\color[rgb]{0,1,0}}%
\expandafter\def\csname LT2\endcsname{\color[rgb]{0,0,1}}%
\expandafter\def\csname LT3\endcsname{\color[rgb]{1,0,1}}%
\expandafter\def\csname LT4\endcsname{\color[rgb]{0,1,1}}%
\expandafter\def\csname LT5\endcsname{\color[rgb]{1,1,0}}%
\expandafter\def\csname LT6\endcsname{\color[rgb]{0,0,0}}%
\expandafter\def\csname LT7\endcsname{\color[rgb]{1,0.3,0}}%
\expandafter\def\csname LT8\endcsname{\color[rgb]{0.5,0.5,0.5}}%
\else
% gray
\def\colorrgb#1{\color{black}}%
\def\colorgray#1{\color[gray]{#1}}%
\expandafter\def\csname LTw\endcsname{\color{white}}%
\expandafter\def\csname LTb\endcsname{\color{black}}%
\expandafter\def\csname LTa\endcsname{\color{black}}%
\expandafter\def\csname LT0\endcsname{\color{black}}%
\expandafter\def\csname LT1\endcsname{\color{black}}%
\expandafter\def\csname LT2\endcsname{\color{black}}%
\expandafter\def\csname LT3\endcsname{\color{black}}%
\expandafter\def\csname LT4\endcsname{\color{black}}%
\expandafter\def\csname LT5\endcsname{\color{black}}%
\expandafter\def\csname LT6\endcsname{\color{black}}%
\expandafter\def\csname LT7\endcsname{\color{black}}%
\expandafter\def\csname LT8\endcsname{\color{black}}%
\fi
\fi
\setlength{\unitlength}{0.0500bp}%
\begin{picture}(7200.00,5040.00)%
\gplgaddtomacro\gplbacktext{%
\csname LTb\endcsname%
\put(902,440){\makebox(0,0)[r]{\strut{}-40}}%
\put(902,933){\makebox(0,0)[r]{\strut{}-30}}%
\put(902,1425){\makebox(0,0)[r]{\strut{}-20}}%
\put(902,1918){\makebox(0,0)[r]{\strut{}-10}}%
\put(902,2410){\makebox(0,0)[r]{\strut{} 0}}%
\put(902,2903){\makebox(0,0)[r]{\strut{} 10}}%
\put(902,3395){\makebox(0,0)[r]{\strut{} 20}}%
\put(902,3888){\makebox(0,0)[r]{\strut{} 30}}%
\put(902,4380){\makebox(0,0)[r]{\strut{} 40}}%
\put(1034,220){\makebox(0,0){\strut{}-10}}%
\put(2515,220){\makebox(0,0){\strut{}-5}}%
\put(3996,220){\makebox(0,0){\strut{} 0}}%
\put(5477,220){\makebox(0,0){\strut{} 5}}%
\put(6958,220){\makebox(0,0){\strut{} 10}}%
\put(3996,4710){\makebox(0,0){\strut{}ciao $x=f_dcdot 5$}}%
}%
\gplgaddtomacro\gplfronttext{%
\csname LTb\endcsname%
\put(5971,4207){\makebox(0,0)[r]{\strut{}f(x)}}%
}%
`
L’eps lo converto in pdf.
Poi scrivo il seguente file latex.
`\documentclass{article}
\usepackage{graphics}
\usepackage{color}
\begin{document}
\begin{figure}
\begin{center}
\scalebox{1.0}{\input{gogo.tex}}
\caption{Enter caption here}
\label{Enter label here}
\end{center}
\end{figure}
\end{document} `
Compilo con pdflatex. Ma mi da un errore di missing endgroup inserted. Ma io teoricamente il file gogo.tex non devo neanche toccarlo. O sbaglio?
Grazie per la pazienza.
Mi sa che mi accontento con i miei file *.png :-))
Saluti.