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53 lines
1.8 KiB
TeX
53 lines
1.8 KiB
TeX
\documentclass{article}
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\usepackage[pdftex,active,tightpage]{preview}
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\setlength\PreviewBorder{2mm}
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\usepackage{pgfplots}
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\usepackage{tikz}
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\usetikzlibrary{arrows, positioning, calc, intersections}
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\begin{document}
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% Define this as a command to ensure that it is same in both cases
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\newcommand*{\ShowIntersection}[2]{
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\fill
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[name intersections={of=#1 and #2, name=i, total=\t}]
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[red, opacity=1, every node/.style={above left, black, opacity=1}]
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\foreach \s in {1,...,\t}{(i-\s) circle (2pt)
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node [above left] {\s}};
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}
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\begin{preview}
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\begin{tikzpicture}
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\begin{axis}[
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axis x line=middle,
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axis y line=middle,
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width=15cm, height=15cm, % size of the image
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grid = major,
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grid style={dashed, gray!30},
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%xmode=log,log basis x=10,
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%ymode=log,log basis y=10,
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xmin=-2, % start the diagram at this x-coordinate
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xmax= 4, % end the diagram at this x-coordinate
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ymin=-7, % start the diagram at this y-coordinate
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ymax= 7, % end the diagram at this y-coordinate
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%/pgfplots/xtick={0,1,...,60}, % make steps of length 5
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%extra x ticks={23},
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%extra y ticks={0.507297},
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axis background/.style={fill=white},
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ylabel=y,
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xlabel=x,
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%xticklabels={,,},
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%yticklabels={,,},
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tick align=outside,
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tension=0.08]
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% plot the stirling-formulae
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\addplot[name path global=a, domain=-2:4, red, thick,samples=500]
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{-x*x*x + 4*x*x-x-4};
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\addplot[name path global=b, domain=0.25:4, blue, thick, dashed] {x-1.2};
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\addplot[name path global=c, domain=0.25:4, blue, thick, dashed] {x+0.42};
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\ShowIntersection{a}{b};
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\end{axis}
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\end{tikzpicture}
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\end{preview}
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\end{document}
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