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

Applying transparency [new]

As of version 4.4, gnuplot supports transparency, which allows us to create attractive and sophisticated effects by setting the opacity of colors in various contexts. This technique is most useful when drawing with styles such as filledcurves using areas of solid color:

How to do it…

The following script will produce the previous figure:

set term svg
set out 'file.svg'
set style fill transparent solid 0.3
plot [0:pi] sin(x)**2 with filledcurves above y1=0 lc rgb  '#00ffff',\0.75*cos(2*x)**2 with filledcurves above y1=0 lc rgb '#aa00aa'

How it works…

We have included an explicit set term command in this recipe because transparency effects are only supported so far by a limited number of terminals. The SVG terminal is a recent addition to the gnuplot repertoire and is the new standard for resolution independent graphics on the Web; it has full support for transparency and produces high quality renderings that scale to any size without pixelation. Also, an SVG graph is...