#### 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.
gnuplot Cookbook
Credits
www.PacktPub.com
Preface
Free Chapter
Plotting Curves, Boxes, Points, and more
Annotating with Labels and Legends
Applying Colors and Styles
Combining Multiple Plots
Programming gnuplot and Dealing with Data
The Third Dimension
Using and Making Graphical User Interfaces
Surveying Special Topics
Finding Help and Information
Index

The following figure is a simple graph of different powers of `x`, color-coded. The colors, which can be seen in the electronic version of the graph, appear here as different shades of gray:

### How to do it…

To produce the previous figure, enter the following sequence of commands at the gnuplot interactive prompt. Alternatively, save them in a file and use the command `gnuplot --persist <file>`, substituting your filename for `<file>`. The `--persist` flag tells gnuplot to keep the plot window open after executing the script. (This script, as well as all the others, are provided with this book as a file named after the recipe.)

```set term x11 solid lw 4
set border lw .25
set key top left
plot [0:1] x**0.5 lc rgb 'orange', x lc rgb 'steelblue',\
x**2 lc rgb 'bisque', x**3  lc rgb 'seagreen'```

### How it works…

In the first line we have chosen the X11 terminal and specified some terminal options. The interactive X11 terminal is usually available on Linux and other Unix...