Trouble with tick label format in pgfplots

Question

With pgfplots I'm experiencing some trouble with tick label format with some "higher" value of coordinates. Here a sample code which is working fine:

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{figure}[htbp]
\begin{tikzpicture}
      \begin{axis}[yticklabel style={/pgf/number format/.cd,1000 sep={\,}}]
            \addplot[red] coordinates{(1, 200) (2, 1500) (3, 9000)};
      \end{axis}
\end{tikzpicture}
\end{figure}
\end{document}

But changing the of (3,9000) by (3,10000) generate this error:

! Package pgfkeys Error: I do not know the key '/pgf/number format/at', to which you passed '(0,1)'

What's happening?

Answer 1

It happens because you change the key family to number format and the next key after evaluating this is the position of the label which is a TikZ key. But because the current key family is /pgf/number format it appends it and hence looks for /pgf/number format/at

Use /pgf/number format/1000 sep instead (you also have to turn the scaling of the axis too).