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52 lines
1.4 KiB
TeX
52 lines
1.4 KiB
TeX
\documentclass[border=2pt]{standalone}
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\usepackage{pgfplots}
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\pgfplotsset{compat=1.16}
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\usepackage{tikz}
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\usepackage{xcolor}
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\definecolor{yellow}{HTML}{cccc00}
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\definecolor{neongreen}{HTML}{00dd00}
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\definecolor{turquoise}{HTML}{00cccc}
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\definecolor{lila}{HTML}{aa00aa}
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\begin{document}
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\pgfplotscreateplotcyclelist{mylist}{%
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{yellow},
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{neongreen, densely dashed},
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{turquoise, dashed},
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{blue,densely dotted},
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{lila,dotted},
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{red,loosely dotted},
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{black}}
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\begin{tikzpicture}
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\begin{axis}[
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title=$\chi^2_k$,
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legend style={at={(0.95, 0.95), anchor=north west}},
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axis x line=middle,
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axis y line=middle,
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grid = major,
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width = 16cm,
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height= 9cm,
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grid style={dashed, gray!30},
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domain = 0.01:8,
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restrict y to domain = 0:1,
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axis background/.style={fill=white},
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xlabel=$x$,
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ylabel=$F_k(x)$,
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tick align=outside,
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enlargelimits=true,
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every axis plot/.append style={very thick},
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cycle list name=mylist
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]
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\foreach \k in {1, 2, 3, 4, 6, 9} {%
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\addplot+[mark={}] gnuplot[raw gnuplot] {%
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igamma2(a,x) = igamma(a,x)*gamma(a);
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chisq(x,k)=igamma2(k/2.0, x/2.0) / gamma(k/2.0);
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set xrange [1.00000e-5:8];
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set yrange [0.00000:1.0];
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samples=800;
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plot chisq(x,\k)};
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\addlegendentryexpanded{$k = \k$}}
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\end{axis}
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\end{tikzpicture}
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\end{document}
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