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Now, I've got it.

One has to place \pgfclearendarrow after having entered \pgfsetendarrow{\pgfarrowto} in order to "close" the command.

I didn't understand why I couldn't determine the direction of the arrow by changing "start" and "end" in the command.
\pgfsetstartarrow{\pgfarrowto ...

A little late, but: thanks Nicola, after applying your advice, it worked well!

Thanks, Thorsten, for your reply and the solution!

But isn't there a simple solution to this problem if I stayed within the pgf package?
I already added some other details to the picture, so that I'm not keen on learning the tikz package to build everything from the beginning onwards.

A simple ...

Dear all,

preparing a presentation, I have a small problem in practice, but not for my nerves. :(

I constructed a graph. It consists of two circles, A and B, connected by two arrows. One points from circle A to B, the other should point the other way round, from B to A. How can I reverse it?

Here ...

Hello!

Just recently, I started using LaTeX. I have the following referencing problem.

If I place a reference for a figure (for the below example: \ref{fig: a figure} ) or a table before this figure or table, then Latex only gives me the output "??".

This doesn't occur when I place the reference ...