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Christian,

Sorry, I have been distracted again -- to much work to do. I'll try to do this when I have some time, and I am sure your suggestions will be very useful. Thanks so much for your effort in helping me out, much appreciated!

Roberto

Sorry guys for the late reply, I have been traveling until yesterday :) Thanks Christian for your suggestion, I run adding \listfiles and found out that, if I understand this correctly, I have version 1.1!!! It says:

pgfplots.sty 2008/08/02 Version 1.1

So I downloaded version 1.6.1 from ...

Stefan,

Many thanks for the super-fast reply! I have looked at the pgfplots manual, and it's a whole new world opening up! I still have troubles, though. When I run the code you provide into Texshop, I get an error message saying "! Package pgfplots Error: Sorry, the supplied plot command is ...

hope anyone can help with this... I have a very basic knowledge of TeXShop for Mac, but I need to plot some functions on it, say y=x. I learnt that this can be done by installing GNU Plot and writing in TeXShop

\begin{tikzpicture}[domain=0:4]
\draw[->] (-0.2,0) -- (4.2,0) node[right] {$x ...