How can I change format of number's axis on pgfplots

I want to change format of x or y number in green box of below graph .

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This is covered in the manual quite extensively. At which point are you stuck? –  percusse May 4 '12 at 7:55
In what way? There are lots of ways of altering the formatting, so we need to know what you mean (font, size, decimal places, ...). –  Joseph Wright May 4 '12 at 7:55
I want change 1o^2 to 100 –  sayros May 4 '12 at 7:57

You can change the formatting for an axis using the every ... system. For example

  \begin{axis}
[
every x tick label/.append style  =
{
/pgf/number format/.cd,
precision = 0,
fixed
}
]


should I think work here. This works by adding some basic pgf number formatting instructions to the end of the code which is used to print the tick labels.

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this approach works well for non-logarithmic axes. Axes with log scale are treated with a different code, in this case, only the exponent is affected by number printing (since many people want an exponent even if it is a real number). –  Christian Feuersänger May 4 '12 at 19:36
@Christian. Hmm, in that case my answer is wrong. Would you write an answer and let me know, and I'll delete this one. –  Joseph Wright May 4 '12 at 19:39
oh, why - simply keep it. It is always good to have a reference for these things. –  Christian Feuersänger May 4 '12 at 19:40
Log-axes however require the log ticks with fixed point key; it reconfigures pgfplots to produces fixed point represantions for log axes:
\begin{axis}[log ticks with fixed point]