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IN ACTION
Understanding data with graphs
Philipp K. Janert
FOREWORDS BY COLIN D. KELLEY AND THOMAS WILLIAMS

MANNING

O PEN S O URCE/ DATA VISUALIZATI O N

Gnuplot IN ACTION
FOREWORDS BY COLIN D. KELLEY

Philipp K. Janert

SEE INSERT

AND T HOMAS W ILLIAMS

G

nuplot is an open source graphics program that helps you analyze, interpret, and present numerical data. Availablefor Unix, Mac, and Windows, it is well maintained, very

“Knee-deep in data? is is your guidebook to exploring it with gnuplot.”
—Austin King Senior Web Developer, Mozilla

Gnuplot in Action is a comprehensive tutorial written for all gnuplot users: data analysts, computer professionals, scientists, researchers, and others. It shows how to apply gnuplot to data analysis problems. It gets intotricky and poorly documented areas. You’ll quickly move from basic charts to advanced graphics, mastering powerful techniques like multi-dimensional and false-color plots. You’ll also learn scripting techniques for unattended batch jobs or how to use gnuplot to generate web graphics on demand.
is book does not require programming skills, nor previous knowledge of gnuplot.

“Sparkles with insightabout visualization, image perception, and data exploration.”
—Richard B. Kreckel, Hacker and Physicist, GiNaC.de

“Incredibly useful for beginners—indispensible for advanced users.”
—Mark Pruett, Systems Architect Dominion

What’s Inside Generate simple and complex graphics Graphic methods to understand data Scripting and advanced visualization Philipp K. Janert has been a gnuplot poweruser for over 15 years, in business and academic environments. He holds a Ph.D. in theoretical physics.
For online access to the author and a free ebook for owners of this book, go to manning.com / GnuplotinAction

“Bridges the gap between gnuplot’s reference manual and real-world problems.”
—Mitchell Johnson So ware Developer, Border Stylo

“A Swiss Army knife for plotting data.”
—NishanthSastry, Computer Cambridge/IBM

ISBN 13: 978-1-933988-39-9 ISBN 10: 1-933988-39-8

53499

MANNING

$34.99 / Can $43.99 [INCLUDING eBOOK]

9 781933 988399

Gnuplot in Action

Gnuplot in Action
Understanding Data with Graphs
PHILIPP K. JANERT

MANNING
Greenwich (74° w. long.)

For online information and ordering of this and other Manning books, please visit www.manning.com.The publisher offers discounts on this book when ordered in quantity. For more information, please contact Special Sales Department Manning Publications Co. Sound View Court 3B fax: (609) 877-8256 Greenwick, CT 06830 email: orders@manning.com

©2010 by Manning Publications Co. All rights reserved.

No part of this publication may be reproduced, stored in a retrieval system, or transmitted, inany form or by means electronic, mechanical, photocopying, or otherwise, without prior written permission of the publisher.

Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in the book, and Manning Publications was aware of a trademark claim, the designations have been printed in initial caps orall caps.

Recognizing the importance of preserving what has been written, it is Manning’s policy to have the books we publish printed on acid-free paper, and we exert our best efforts to that end. Recognizing also our responsibility to conserve the resources of our planet, Manning books are printed on paper that is at least 15 percent recycled and processed without the use of elemental chlorine.Manning Publications Co. Sound View Court 3B Greenwich, CT 06830

Development editor: Copyeditor: Proofreader: Typesetter: Cover designer:

Nermina Miller, Tom Cirtin Benjamin Berg Katie Tennant Dottie Marsico Marija Tudor

ISBN 978-1-933988-39-9 Printed in the United States of America 1 2 3 4 5 6 7 8 9 10 – MAL – 14 13 12 11 10 09

The purpose of computing is insight, not numbers....
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