Book Image

gnuplot Cookbook

By : Lee Phillips
Book Image

gnuplot Cookbook

By: Lee Phillips

Overview of this book

gnuplot is the world's finest technical plotting software, used by scientists, engineers, and others for many years. It is in constant development and runs on practically every operating system, and can produce output in almost any format. The quality of its 3d plots is unmatched and its ability to be incorporated into computer programs and document preparation systems is excellent. gnuplot Cookbook ñ it will help you master gnuplot. Start using gnuplot immediately to solve your problems in data analysis and presentation. Quickly find a visual example of the graph you want to make and see a complete, working script for producing it. Learn how to use the new features in gnuplot 4.4. Find clearly explained, working examples of using gnuplot with LaTeX and with your own computer programming language. You will master all the ins and outs of gnuplot through gnuplot Cookbook. You will learn to plot basic 2d to complex 3d plots, annotate from simple labels to equations, integrate from simple scripts to full documents and computer progams. You will be taught to annotate graphs with equations and symbols that match the style of the rest of your text, thus creating a seamless, professional document. You will be guided to create a web page with an interactive graph, and add graphical output to your simulation or numerical analysis program. Start using all of gnuplot's simple to complex features to suit your needs, without studying its 200 page manual through this Cookbook.
Table of Contents (18 chapters)
gnuplot Cookbook
About the Author
About the Reviewers
Finding Help and Information

Mapping the Earth

The main purpose of this recipe is to call attention to the fact that gnuplot comes with a very useful datafile called world.dat. This consists of coordinates for a rough outline of the Earth's land masses, as latitude and longitude in the usual degree units. It can be used as a map background for plotting other geographically relevant data. In the following figure, we've overlaid some data on recent earthquake activity:

Getting ready

We've included a copy of the world.dat datafile in case you've mislaid the one that comes with gnuplot. You also need to have the file earthquakes.dat. This contains data from the United States Geological Survey and contains the locations, magnitudes, and other information about all the earthquakes in the world for three recent days. We've simply changed the format in which the latitudes and longitudes are recorded to make the data digestible by gnuplot. The S (South) and W (West) coordinates were turned into negative numbers and N (North) and...