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\subsection{Number Formatting Options}
\label{sec:number:printing}%
\PGFPlots\ typesets tick labels rounded to given precision and in configurable number formats. The command to do so is |\pgfmathprintnumber|; it uses the current set of number formatting options.
These options are described in all detail in the manual for \PGFPlotstable, which comes with \PGFPlots. Please refer to that manual.
\begin{command}{\pgfmathprintnumber\marg{x}}
Generates pretty-printed output for the (real) number \meta{x}. The input number \meta{x} is parsed using |\pgfmathfloatparsenumber| which allows arbitrary precision.
Numbers are typeset in math mode using the current set of number printing options, see below. Optional arguments can also be provided using |\pgfmathprintnumber[|\meta{options}|]|\marg{x}.
Please refer to the manual of \PGFPlotstable\ (shipped with this package) for details about options related to number-printing.
\end{command}
\label{sec:identify:minor:log}%
\begin{pgfplotskey}{log identify minor tick positions=\mchoice{true,false} (initially false)}
Set this to |true| if you want to identify log--plot tick labels at positions
\[ i \cdot 10^j \]
with $i \in \{2,3,4,5,6,7,8,9\},\, j \in \Z$. This may be valuable in conjunction with the `|extra x ticks|' and `|extra y ticks|' options.
\begin{codeexample}[]
\begin{tikzpicture}%
\begin{loglogaxis}
[title=Standard options,
width=6cm]
\addplot coordinates {
(1e-2,10)
(3e-2,100)
(6e-2,200)
};
\end{loglogaxis}
\end{tikzpicture}%
\end{codeexample}
\begin{codeexample}[]
\pgfplotsset{every axis/.append style={%
width=6cm,
xmin=7e-3,xmax=7e-2,
extra x ticks={3e-2,6e-2},
extra x tick style={major tick length=0pt,font=\footnotesize}
}}%
\begin{tikzpicture}%
\begin{loglogaxis}[
xtick={1e-2},
title=with minor tick identification,
extra x tick style={
log identify minor tick positions=true}]
\addplot coordinates {
(1e-2,10)
(3e-2,100)
(6e-2,200)
};
\end{loglogaxis}
\end{tikzpicture}%
\begin{tikzpicture}%
\begin{loglogaxis}[
xtick={1e-2},
title=without minor tick identification,
extra x tick style={
log identify minor tick positions=false}]
\addplot coordinates {
(1e-2,10)
(3e-2,100)
(6e-2,200)
};
\end{loglogaxis}%
\end{tikzpicture}%
\end{codeexample}
This key is set by the default styles for extra ticks.
\end{pgfplotskey}
\begin{pgfplotscodekey}{log number format code}
Provides \TeX-code to generate log plot tick labels. Argument `|#1|' is the (natural) logarithm of the tick position.
The default implementation invokes |log base 10 number format code| after it changed the log basis to~$10$. It also checks the other log plot options.
This key will have a different meaning when the log basis has been chosen explicitly, see the |log basis x| key.
\end{pgfplotscodekey}
\begin{pgfplotscodekey}{log base 10 number format code}
Allows to change the overall appearance of base 10 log plot tick labels. The default is
\begin{codeexample}[code only]
\pgfplotsset{
log base 10 number format code/.code={$10^{\pgfmathprintnumber{#1}}$}
}
\end{codeexample}
where the `|log plot exponent style|' allows to change number formatting options.
\end{pgfplotscodekey}
\begin{pgfplotscodekey}{log number format basis}
This part of the representation routines for log ticks in \emph{arbitrary} basis (see the |log basis x| key). It is used instead of the key above if the log basis has been changed. The first supplied argument is the log basis, the second the exponent. The initial configuration is
\begin{codeexample}[code only]
\pgfplotsset{
/pgfplots/log number format basis/.code 2 args={$#1^{\pgfmathprintnumber{#2}}$}
}
\end{codeexample}
\end{pgfplotscodekey}
\begin{pgfplotskey}{log plot exponent style=\marg{key-value-list}}
Allows to configure the number format of log plot exponents. This style is installed just before `|log base 10 number format code|' will be invoked. Please note that this style will be installed within the default code for `|log number format code|'.
\begin{codeexample}[]
\pgfplotsset{
samples=15,
width=7cm,
xlabel=$x$,
ylabel=$f(x)$,
extra y ticks={45},
legend style={at={(0.03,0.97)},
anchor=north west}}
\begin{tikzpicture}
\begin{semilogyaxis}[
log plot exponent style/.style={
/pgf/number format/fixed zerofill,
/pgf/number format/precision=1},
domain=-5:10]
\addplot {exp(x)};
\addplot {exp(2*x)};
\legend{$e^x$,$e^{2x}$}
\end{semilogyaxis}
\end{tikzpicture}
\end{codeexample}
\begin{codeexample}[]
\pgfplotsset{
samples=15,
width=7cm,
xlabel=$x$,
ylabel=$f(x)$,
extra y ticks={45},
legend style={at={(0.03,0.97)},
anchor=north west}}
\begin{tikzpicture}
\begin{semilogyaxis}[
log plot exponent style/.style={
/pgf/number format/fixed,
/pgf/number format/use comma,
/pgf/number format/precision=2},
domain=-5:10]
\addplot {exp(x)};
\addplot {exp(2*x)};
\legend{$e^x$,$e^{2x}$}
\end{semilogyaxis}
\end{tikzpicture}
\end{codeexample}
\end{pgfplotskey}
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