What is a good (LINUX) software package for drawing diagrams?

[SUDOnym]

Can anyone recomment any good linux software for produce "physics type" diagrams that would be of acceptable quality for putting into reports? When I say "physics type", I mean we're basically talking about straight and curved lines, vectors (arrows), angles and so on... of course I want to be able to label them all nicely as well... .
If anyone is familiar with the book on Electromagnetism by Griffiths - I think these diagrams are an excellent example of what I mean by "physics type" and would love to know what software he used to make them!

Thanks

 

[chiro]

Hey SUDOnym.

This is a good package that is not only free but also works in a linux environment:

http://www.gnu.org/software/octave/

I think you should check it out.

 

[jhae2.718]

I've used Inkscape and Dia. They're vector drawing programs, and are ok for diagrams.

 

[phyzguy]

Python Matplotlib works great for all of this kind of stuff.

 

[DrDu]

gnuplot or xmgrace

 

[Simon_Tyler]

There's always the classic Xfig (http://en.wikipedia.org/wiki/Xfig)