csv-bivariate-normal-distribution: added

tikz/csv-bivariate-normal-distribution/Makefile

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+SOURCE = csv-bivariate-normal-distribution
+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/csv-bivariate-normal-distribution/README.md

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+Compiled example
+----------------
+![Example](csv-bivariate-normal-distribution.png)

tikz/csv-bivariate-normal-distribution/create.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""Create samples for bivariate distribution"""
+
+from numpy.random import multivariate_normal, seed
+
+
+def create_data(n):
+    means = [0.0, 0.0]
+    cov = [[1.0, 0.7], [0.7, 4.0]]
+    seed(0)
+    samples = multivariate_normal(means, cov, n)
+    with open("data.csv", "w") as f:
+        f.write("x,y\n")
+        for datapoint in samples:
+            f.write("%0.4f,%0.4f\n" % tuple(datapoint))
+
+
+def get_parser():
+    from argparse import ArgumentParser, ArgumentDefaultsHelpFormatter
+    parser = ArgumentParser(description=__doc__,
+                            formatter_class=ArgumentDefaultsHelpFormatter)
+    parser.add_argument("-n",
+                        dest="n",
+                        default=5000,
+                        type=int,
+                        help="Number of points to generate")
+    return parser
+
+
+if __name__ == "__main__":
+    args = get_parser().parse_args()
+    create_data(args.n)

tikz/csv-bivariate-normal-distribution/csv-bivariate-normal-distribution.tex

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+\documentclass[varwidth=true, border=2pt]{standalone}
+\usepackage[utf8]{inputenc} % this is needed for umlauts
+\usepackage[ngerman]{babel} % this is needed for umlauts
+\usepackage[T1]{fontenc}    % this is needed for correct output of umlauts in pdf
+\usepackage[margin=2.5cm]{geometry} %layout
+
+\usepackage{pgfplots}
+\pgfplotsset{compat=newest}
+\usetikzlibrary{plotmarks}
+
+\begin{document}
+\tikzset{mark options={line width=0.5pt}}
+\begin{tikzpicture}
+    \begin{axis}[
+            width=7.5cm, height=15cm,     % size of the image
+            enlarge x limits=0.05,
+            enlarge y limits=0.05,
+            xmin = -5,
+            xmax = 5,
+            ymin = -10,
+            ymax = 10,
+            % xlabel=x,
+            % ylabel=y
+         ]
+          \addplot[scatter,
+                   only marks,
+                   mark=*,
+                   mark size = 1,
+                   point meta=1,
+                   ]
+                   table [x=x, y=y, col sep=comma] {data.csv};
+    \end{axis}
+\end{tikzpicture}
+\end{document}