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

Plotting boxes

Gnuplot's box style is similar to a bar chart, with each value plotted as a box extending up from the axis. You can have the boxes filled with patterns, solid colors, or leave them empty.

This style is commonly used either as a type of histogram (covered later in this chapter) or as a way to compare a set of disparate items. The following figure plots boxes using the fill pattern:

How to do it…

It just takes the following script to get the previous figure:

set style fill pattern
plot [-6:6]  besj0(x) with boxes, sin(x) with boxes

How it works…

The first command tells gnuplot to fill the boxes with a fill pattern, cycling through the patterns available on the selected output device for each plot on the graph. The second command plots the two specified functions using the boxes style, which draws a box from the x-axis to the y value for each point.

There's more…

You can specify empty boxes with set style fill empty or a solid color with set style fill solid, and of course you can select the fill style explicitly with set style fill pattern n, where n is any integer associated with a fill style in the selected terminal.