Graphics, Figures & Tables ⇒ Accessing individual table elements with pgfplots

[Naer]

Hello!
I have some problem with example on this site: http://tex.stackexchange.com/questions/ ... h-pgfplots

Those lines:

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\pgfmathsetmacro{\rows}{\pgfplotsretval}
\pgfplotstablegetcolsof{\data} % Determine no. of cols
\pgfmathsetmacro{\cols}{\pgfplotsretval}

and commands:

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\pgfplotstablegetcolsof \pgfplotsretval

seem to not work completely.
Error messages:

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Undefined control sequence:  \pgfmathsetmacro{\cols}{\pgfplotsretval}(followed by:)
Undefined control sequence:  \pgfmathsetmacro{\rows}{\pgfplotsretval} (followed by: )
Undefined control sequence:  \pgfplotstablegetcolsof (followed by: {\data} % Determine no. of cols)
Undefined control sequence:  \pgfplotstablegetcolsof{\data (followed by: } % Determine no. of cols)

What is wrong? Some package is missing?

I'm running Debian Sid with texlive (2009-11) and pgf (2.10-1)

Thanks for any help