added hidden markov model

tikz/hidden-markov-model-abc/Makefile

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+SOURCE = hidden-markov-model-abc
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot
+
+gif:
+	pdfcrop $(SOURCE).pdf
+	convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
+	make clean
+
+png:
+	make
+	make svg
+	inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png
+
+transparentGif:
+	convert $(SOURCE).pdf -transparent white result.gif
+	make clean
+
+svg:
+	make
+	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
+	pdf2svg $(SOURCE).pdf $(SOURCE).svg
+	# Necessary, as pdf2svg does not always create valid svgs:
+	inkscape $(SOURCE).svg --export-plain-svg=$(SOURCE).svg
+	rsvg-convert -a -w $(WIDTH) -f svg $(SOURCE).svg -o $(SOURCE)2.svg
+	inkscape $(SOURCE)2.svg --export-plain-svg=$(SOURCE).svg
+	rm $(SOURCE)2.svg

tikz/hidden-markov-model-abc/Readme.md

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+Compiled example
+----------------
+![Example](hidden-markov-model-abc.png)

tikz/hidden-markov-model-abc/hidden-markov-model-abc.tex

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+\documentclass[varwidth=true, border=2pt]{standalone}
+\usepackage{units}
+\usepackage{ifthen}
+\usepackage{tikz}
+\usetikzlibrary{calc} 
+
+\begin{document}
+\tikzstyle{vertex}=[draw,black,fill=blue,circle,minimum size=10pt,inner sep=0pt]
+\tikzstyle{edge}=[very thick]
+\begin{tikzpicture}[scale=2.5]
+    \node (a)[vertex,fill=gray!10,align=left] at (0,0) {$A~\nicefrac{1}{3}$\\$B~\nicefrac{1}{6}$\\$C~\nicefrac{1}{2}$};
+    \node (b)[vertex,fill=gray!10,align=left] at (1,0)  {$A~\nicefrac{2}{5}$\\$B~\nicefrac{1}{5}$\\$C~\nicefrac{2}{5}$};
+
+    \path[thick,->] (a)    edge node [anchor=center,above,sloped] {$\nicefrac{9}{10}$} (b);
+    \path[thick,->] (a)    edge[loop above, looseness=5] node [anchor=center,above,sloped] {$\nicefrac{1}{10}$} (a);
+    \path[thick,->] (b)    edge[loop above, looseness=5] node [anchor=center,above,sloped] {$1$} (b);
+\end{tikzpicture}
+\end{document}