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Is there documentation for which functions work as pgfplots expressions (like sin, cos, exp, etc.) The pgfplots documentation doesn't seem to say anything on what you can/can't use.

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The pgfplots package uses pgfmath expressions from the pgf package. See the TikZ/PGF manual (pgfmanual.pdf) in part VI, section 63 "Syntax for mathematical expressions", page 527 in PGF v2.10 for a list of all available PGF math expressions. You can also add your own, but some programming is required for that.

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I'm not sure that pgfplots uses all the pgfmath functions of the pgf 2.1 version. I have the impression that pgfplots uses the functions of pgf 2.0 and I'm not sure that you can use in pgfplots a personal function created with pgfmathdeclarefunction. Perhaps I'm wrong but if you have an example I think a lot of users will be happy ! I have some difficulties with the english language but there is pgfplotstodo document somewhere ... – Alain Matthes Apr 10 '11 at 9:24
@Altermundus: AFAIK pgfplots passes the math expressions to pgf in whatever version installed and uses the return value. This would allow for all available functions including self-defined ones. However, I didn't tested that by myself. – Martin Scharrer♦ Apr 10 '11 at 9:31
I sent an email to Christian Feuersaenger. I hope he has enough time to give an answer because my first tests are negative. – Alain Matthes Apr 10 '11 at 9:36
PGFPlots uses the fpu library of pgf -- which is supposed to contain all math functions. But it might happen that some new functions need to be ported to the fpu. Can you send me an example? Perhaps I can improve some things. – Christian Feuersänger Apr 18 '11 at 20:50
@Feuersaenger: I think you mean Altermundus, don't you? You need to add @Altermundus in your comment so that he gets notified. – Martin Scharrer♦ Apr 18 '11 at 20:55

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