gnuplot An Interactive Plotting Program Thomas Williams & Colin Kelley Version 3.7 organized by: David Denholm Major contributors (alphabetic order): Hans-Bernhard Broeker John Campbell Robert Cunningham David Denholm Gershon Elber Roger Fearick Carsten Grammes Lucas Hart Lars Hecking Thomas Koenig David Kotz Ed Kubaitis Russell Lang Alexander Lehmann Alexander Mai Carsten Steger Tom Tkacik Jos Van der Woude James R. Van Zandt Alex Woo Copyright (C) 1986 - 1993, 1998 Thomas Williams, Colin Kelley Mailing list for comments: [email protected] Mailing list for bug reports: [email protected] This manual was prepared by Dick Crawford. 3 December 1998 Contents I Gnuplot 1 1 Copyright 1 2 Introduction 1 3 Seeking-assistance 2 4 What’s New in version 3.7 3 5 Batch/Interactive Operation 4 6 Command-line-editing 4 7 Comments 5 8 Coordinates 5 9 Environment 6 10 Expressions 6 10.1 Functions . 7 10.2 Operators . 9 10.2.1 Unary . 9 10.2.2 Binary . 9 10.2.3 Ternary . 10 10.3 User-defined . 11 11 Glossary 11 12 Plotting 12 13 Start-up 12 14 Substitution 12 15 Syntax 13 16 Time/Date data 14 II Commands 14 17 Cd 15 18 Call 15 19 Clear 16 20 Exit 16 21 Fit 16 21.1 Adjustable parameters . 17 21.2 Beginner’s guide . 18 21.3 Error estimates . 19 21.3.1 Statistical overview . 19 21.3.2 Practical guidelines . 20 21.4 Fit controlling . 20 21.4.1 Control variables . 20 21.4.2 Environment variables . 21 21.5 Multi-branch . 21 21.6 Starting values . 22 21.7 Tips . 22 22 Help 23 23 If 23 24 Load 23 25 Pause 24 26 Plot 24 26.1 Data-file . 25 26.1.1 Every . 26 26.1.2 Example datafile . 26 26.1.3 Index . 27 26.1.4 Smooth . 27 26.1.4.1 Acsplines . 27 26.1.4.2 Bezier . 28 26.1.4.3 Csplines . 28 26.1.4.4 Sbezier . 28 26.1.4.5 Unique . 28 26.1.5 Special-filenames . 28 26.1.6 Thru . 29 26.1.7 Using . 29 26.2 Errorbars . 31 26.3 Parametric . 31 26.4 Ranges . 32 26.5 Title . 33 26.6 With . 33 27 Print 34 28 Pwd 35 29 Quit 35 30 Replot 35 31 Reread 35 32 Reset 36 33 Save 36 34 Set-show 36 34.1 Angles . 37 34.2 Arrow . 37 34.3 Autoscale . 38 34.3.1 Parametric mode . 39 34.3.2 Polar mode . 39 34.4 Bar ................................................ 40 34.5 Bmargin . 40 34.6 Border . 40 34.7 Boxwidth . 41 34.8 Clabel . 41 34.9 Clip . 42 34.10 Cntrparam . 42 34.11 Contour . 43 34.12 Data style . 44 34.13 Dgrid3d . 44 34.14 Dummy . 45 34.15 Encoding . 46 34.16 Format . 46 34.16.1 Format specifiers . 46 34.16.2 Time/date specifiers . 47 34.17 Function style . 48 34.18 Functions . 48 34.19 Grid . 49 34.20 Hidden3d . 49 34.21 Isosamples . 51 34.22 Key . 51 34.23 Label . 53 34.24 Linestyle . 54 34.25 Lmargin . 54 34.26 Locale . 55 34.27 Logscale . 55 34.28 Mapping . 55 34.29 Margin . 56 34.30 Missing . 56 34.31 Multiplot . 56 34.32 Mx2tics . 57 34.33 Mxtics . 57 34.34 My2tics . 58 34.35 Mytics . 58 34.36 Mztics . ..