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

Placing tics on the second y-axis

In this recipe, we revisit the technique introduced in Chapter 1, Plotting Curves, Boxes, Points, and more for plotting two curves on one graph, each with its own independent y-axis. The following figure provides an example for this recipe:

How to do it…

Run the following script through gnuplot to produce the previous figure:

set ytics nomirror
set y2tics 0.4
set my2tics 4
set xtics pi/4.
set mxtics 4
set grid
plot [0:2*pi] sin(x) axis x1y1, 2*cos(8*x)*exp(-x) axis x1y2

How it works…

As we saw in Chapter 1, Plotting Curves, Boxes, Points, and more, the command set ytics nomirror tells gnuplot to not duplicate the tics on the left (y1) axis with the tics on the right (y2) axis. This allows us to use two independent scales so we can plot two curves with different ranges on the same graph. However, we must explicitly tell gnuplot what tic interval to use on the y2 axis, or it will simply omit the tics there. This is the purpose of the second code line, which sets...