# Documentation for pgfplots expressions?

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.
@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
@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