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

Styling your curves

This recipe delves into more detail about the linetypes we've seen before and introduces the powerful concept of linestyles.

How to do it…

Following is the script that makes the previous figure:

set key top left
set style line 1 lt 3 lw 4 lc rgb '#990042'         
set style line 2 lt 7 lw 3 lc rgb '#31f120'         
set style line 3 lt 2 lw 3 lc rgb '#0044a5'         
set style line 4 lt 9 lw 4 lc rgb '#888888'         
plot [0:1] x**0.5 ls 1, x ls 2, x**2 ls 3, x**3 ls 4

How it works…

In this recipe, we have introduced userstyles. With the invocation set style line n you can define a set of properties that will be associated with the index n in subsequent plot commands. In order to call up these properties, simply append the phrase ls n, substituting the desired index for n, to the plot command. ls is an abbreviation for linestyle.

The advantages of linestyles are that they can be reused repeatedly, can save considerable typing or space in gnuplot scripts, and can help to...