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Band2/Grafiken/B2.1.tex

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+%!tikz editor 1.0
+\documentclass{article}
+\usepackage{tikz}
+\usepackage[graphics, active, tightpage]{preview}
+\usepackage{circuitikz}
+\PreviewEnvironment{tikzpicture}
+
+%!tikz preamble begin
+\usepackage{pgfplots}
+%!tikz preamble end
+
+
+\begin{document}
+%!tikz source begin
+\begin{tikzpicture}[line cap=round,line join=round,x=1cm,y=1cm,scale=3]
+\tikzset{
+        every pin/.style={fill=yellow!50!white,rectangle,rounded corners=3pt,font=\tiny},
+        small dot/.style={fill=black,circle,scale=0.3},}
+\begin{axis}[
+x=2cm,y=2cm,
+axis lines=middle,
+axis line style = {-latex},
+xmin=-2.5,
+xmax=2.5,
+ymin=-0.5,
+ymax=4,
+%ytick={1,2},
+%yticklabels={1,2},
+xtick=\empty,
+xlabel=$x$,
+ylabel=$y$,
+extra x ticks={0.5},
+    extra x tick style={
+        tick label style={anchor=north}},
+    extra x tick labels={$\frac{1}{2}$},
+extra y ticks={0.25},
+     extra y tick style={
+        tick label style={anchor=east}},
+    extra y tick labels={$\frac{1}{4}$},
+enlargelimits = true,
+]
+
+
+
+\draw [thick, dashed] (axis cs: -0.05,1) -- (axis cs: 0.5,1);
+\draw [thick, dashed] (axis cs: 0.5,-0.05) -- (axis cs: 0.5,1);
+
+
+\addplot[domain=-2:2, blue, line width=1,samples=2000] {x^2};
+
+\addplot[color=blue!80!black, only marks, style={mark=*}] coordinates {(0.5,2)};
+
+\draw [ultra thin, dashed] (axis cs: -.05,1/4) -- (axis cs: 1/2,1/4);
+\draw [thick, dashed] (axis cs: 0.5,1) -- (axis cs: 0.5,2);
+
+
+
+\scriptsize{ \node () at (axis cs:2.4,1.8) {$\displaystyle y=\left\{ \begin{array}{rl}
+\frac{x^2-\frac{1}{4}}{x-\frac{1}{2}} & \text{für}\; x \neq \frac{1}{2}\\ \\
+2 & \text{für}\; x = \frac{1}{2}\\
+\end{array}
+\right .$};}
+
+% \draw[] (axis cs:1.3, 0.1) -- (axis cs:1.3, -0.1);
+% \node () at (axis cs:1.3,-0.25) {$x_0$};
+
+% \draw[] (axis cs:1.14,-0.05) -- (axis cs:1.14, 0.05);
+% \node () at (axis cs:0.33,-0.45) {$\frac{1}{\pi}$};
+
+\end{axis}
+\end{tikzpicture}
+%!tikz source end
+
+\end{document}