\documentclass{article} \usepackage{tikz} \usepackage{amsmath} \usetikzlibrary{intersections,calc} \begin{document} \centering \begin{tikzpicture}[domain=0:6, range=4:5, thick] \pgfmathsetlengthmacro{\lengthXaxis}{6cm} \pgfmathsetlengthmacro{\lengthYaxis}{5cm} \pgfmathsetlengthmacro{\radiusArcFigureOne}{5.5cm} \draw [->] (0,0) -- (0,\lengthYaxis) node[above] {$\pmb{x_1,\textcolor{cyan}{x_2}}$}; \draw [->] (0,0) -- (\lengthXaxis,0) node[right] {$\pmb{\textcolor{green}{y}}$}; \draw [name path global=f1a] (\radiusArcFigureOne,0) arc [ start angle=0, end angle=90, x radius=\radiusArcFigureOne, y radius=(3*\radiusArcFigureOne/4)-2mm ] ; \draw[name path global=f1b, thick, color=purple, domain=2.5:8, shift={(-2,.7)}] plot (\x,{25*exp(-.7*\x-.25)+.7}) node[right] {$\bar{u}_2$} ; \begin{scope}[yshift=-6cm] \draw [->, name path global=f2xline] (0,0) -- (\lengthXaxis,0) node[right] {$\pmb{\textcolor{green}{y}}$}; \draw [->] (0,0) -- (0,\lengthYaxis) node[above] {$\pmb{x_1}$}; \draw[name path global=f5, thick, color=cyan, domain=4:8, shift={(-2,-.067)}] plot (\x,{15*exp(-.5*\x-.35)+.75}) node[right] {$u^{\ast}_1$}; \end{scope} \begin{scope}[yshift=-12cm] \draw [->] (0,0) -- (0,\lengthYaxis) node[above] {$\textcolor{cyan}{\pmb{x_2}}$}; \draw [->, name path global=f3xline] (0,0) -- (\lengthXaxis,0) node[right] {$\pmb{\textcolor{green}{y}}$}; \draw[name path global=f3a, thick, color=purple, domain=3:5.5, shift={(-.5,-.4)}] plot (\x,{25*exp(-.7*\x-.25)+.7}) node[left,yshift=-.125cm]{$\bar{u}_2$}; \draw[name path global=f3b, thick, color=purple, domain=3:5.5, shift={(-1.5,-.4)}] plot (\x,{25*exp(-.7*\x-.25)+.7}); \draw[name path global=f3c, thick, color=purple, domain=3:5.5, shift={(.5,-.4)}] plot (\x,{25*exp(-.7*\x-.25)+.7}); \end{scope} \path [name intersections={of=f1a and f1b, by={is f1 left, is f1 right}}]; \path [name path=left vline]% vertical line (is f1 left) -- (is f1 left|-current bounding box.south) ; \path [name intersections={of=f2xline and left vline, by=is f2xline left vline}]; \draw [dotted] (is f1 left) node[above,xshift=.125cm]{$A$} -- (is f2xline left vline) node[below]{$A’$}; \path [name path=right vline]% s.o. (is f1 right) -- (is f1 right|-current bounding box.south) ; \path [name intersections={of=f2xline and right vline, by=is f2xline right vline}]; \draw [dotted] (is f1 right) node[above,xshift=.125cm]{$B$}-- (is f2xline right vline) node[below]{$B’$}; \draw [name path global=f6] let \p1 = ($ (is f2xline left vline) - (is f2xline right vline) $), \n2 = {veclen(\x1,\y1)/2} in (is f2xline right vline) arc [start angle=0, end angle=180, x radius=\n2, y radius=2*\n2/3] coordinate[midway] (j1); \path [name intersections={of=f5 and f6, by=i1,total=\t}]; %\pgfextra{\typeout{\t}}; \path [name path=iline]% s.o. (i1|-current bounding box.north) -- (i1|-current bounding box.south) ; \path [name intersections={of=f1a and iline, by=i2}, name intersections={of=f1b and iline, by=i3}, name intersections={of=f3a and iline, by=i4}]; \draw [dotted] (i2|-0,-12) node[below]{$y^{\ast}$} |- (i2-|0,0) node[left]{$x^{\ast}$} foreach \X in {1,3,4} {(i\X) node[above]{$C’$} -- (i\X-|0,0)} node[left]{$x_2^{\ast}$}; \path [name path=jline]% s.o. (j1|-current bounding box.north) -- (j1|-current bounding box.south) ; \path [name intersections={of=f1b and jline, by=j2}]; \draw [dotted] (j2|-0,-6) |- (j2-|0,0) node{$bbb$}; \end{tikzpicture} \end{document}
tikz - Nodebezeichnung
tikz - Nodebezeichnung
Würde gerne im zweiten Diagramm im Punkt $C'$ $x^{\ast}_1$ auf der x-Achse eintragen. Leider schaffe ich es nicht.