Add perceptron-unit

tikz/perceptron-unit/Makefile

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+SOURCE = perceptron-unit
+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/perceptron-unit/README.md

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+Compiled example
+----------------
+![Example](perceptron-unit.png)

tikz/perceptron-unit/perceptron-unit.tex

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+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+
+\usepackage{tikz}
+\usetikzlibrary{arrows}
+
+\tikzstyle{inputNode}=[draw,circle,minimum size=10pt,inner sep=0pt,fill=red!50]
+\tikzstyle{stateTransition}=[->, thick]
+\tikzstyle{hidden}=[draw,circle,minimum size=25pt,inner sep=0pt,fill=green!50]
+\tikzstyle{output}=[draw,fill=blue!50,circle,minimum size=10pt,inner sep=0pt]
+
+\begin{document}
+\begin{preview}
+\begin{tikzpicture}
+    \node[hidden] (x) at (0,0) {$\Sigma$ $\varphi$};
+
+    \node[inputNode] (x0) at (-2, 1.5) {$\tiny x_0$};
+    \node[inputNode] (x1) at (-2, 0.75) {$\tiny x_1$};
+    \node[inputNode] (x2) at (-2, 0) {$\tiny x_2$};
+    \node[inputNode] (x3) at (-2, -0.75) {$\tiny x_3$};
+    \node[inputNode] (xn) at (-2, -1.75) {$\tiny x_n$};
+
+    \draw[stateTransition] (x0) to[out=0,in=120] node [midway, sloped, above=-2] {$w_0$} (x);
+    \draw[stateTransition] (x1) to[out=0,in=150] node [midway, sloped, above=-2] {$w_1$} (x);
+    \draw[stateTransition] (x2) to[out=0,in=180] node [midway, sloped, above=-2] {$w_2$} (x);
+    \draw[stateTransition] (x3) to[out=0,in=210] node [midway, sloped, above=-2] {$w_3$} (x);
+    \draw[stateTransition] (xn) to[out=0,in=240] node [midway, sloped, above=-2] {$w_n$} (x);
+    \draw[stateTransition] (x) -- (1.5,0) node[right] {$o$};
+    \draw[dashed] (0,-0.43) -- (0,0.43);
+    \node (dots) at (-2, -1.15) {$\vdots$};
+\end{tikzpicture}
+\end{preview}
+\end{document}