\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}