Added sigmoid-function

tikz/sigmoid-function/Makefile

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+SOURCE = sigmoid-function
+DELAY = 80
+DENSITY = 300
+WIDTH = 500
+
+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:
+	#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

tikz/sigmoid-function/Readme.md

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+Compiled example
+----------------
+![Example](sigmoid-function.png)

tikz/sigmoid-function/sigmoid-function.tex

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+\documentclass[varwidth=false, border=2pt]{standalone}
+
+\usepackage{pgfplots}
+\usepackage{tikz}
+\usepackage{tkz-fct}
+\usetikzlibrary{arrows}
+
+\begin{document}
+\begin{tikzpicture}
+    \begin{axis}[
+    	legend pos=north west,
+        axis x line=middle,
+        axis y line=middle,
+        grid = major,
+        width=16cm,
+        height=8cm,
+        grid style={dashed, gray!30},
+        xmin=-1,     % start the diagram at this x-coordinate
+        xmax= 1,    % end   the diagram at this x-coordinate
+        ymin= 0,     % start the diagram at this y-coordinate
+        ymax= 1,   % end   the diagram at this y-coordinate
+        %axis background/.style={fill=white},
+        xlabel=x,
+        ylabel=y,
+        tick align=outside,
+        enlargelimits=false]
+      % plot the stirling-formulae
+      \addplot[domain=-1:1, red, ultra thick,samples=500] {1/(1+exp(-5*x))}; 
+      \addplot[domain=-1:1, blue, ultra thick,samples=500] {1/(1+exp(-10*x))}; 
+      \addlegendentry{$f(x)=\frac{1}{1+e^{-5x}}$}
+      \addlegendentry{$g(x)=\frac{1}{1+e^{-10x}}$}
+    \end{axis} 
+\end{tikzpicture}
+\end{document}