📚 The CoCalc Library - books, templates and other resources
License: OTHER
Compiled example

Creation
Make sure that
gnuplotis installed and in your PATH.You can let Wolfram|Alpha calculate you gradients (http://www.wolframalpha.com/input/?i=gradient+of+x%2F(e^(x^2%2By^2)))
See http://en.wikibooks.org/wiki/LaTeX/Colors for colors
Credits
Jake helped me to remove the small white border at the left side which was caused by the arrows. See Why does PGFplots plot more than the desired range in a 3D plot?.