The QtiPlot Handbook

Ion Vasilief

<ion.vasilief@qtiplot.com>

Copyright © 2004 - 2023 Ion Vasilief

Copyright © 2010 Stephen Besch

Copyright © 2006 - june 2007 Roger Gadiou and Knut Franke

This document is a handbook for using QtiPlot, a program for two- and three-dimensional graphical presentation of data sets and for data analysis.

This manual is organized in several chapters:

-The first chapter describes the main concepts and terms which are used in QtiPlot.

-The second chapter is a tutorial on how to obtain plots from different data sets. It is the one you need to read first to understand the basics of QtiPlot and to be able to draw plots.

-The three following chapters are descriptions of all the commands, buttons and dialogs used in QtiPlot. These chapters are the reference manual of QtiPlot.

- The two following chapters describe more deeply some specific possibilities of QtiPlot, that is the statistical and mathematical analysis of data, and the scripting.

Legal notice: Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts.

Table of Contents

1. Introduction

What QtiPlot does

Command Line Parameters

Specify a File
Command Line Options

General Concepts and Terms

Tables
Excel workbooks
Matrix
Plot Window
Note
Results Log Window
The Project Explorer
The Quick Help Window
The Scripting Console

Interoperability with other scientific software

OriginLab
Microsoft Excel
LibreOffice and Apache OpenOffice

2. Drawing plots with QtiPlot

2D plot from data.
2D plot from function.

Direct 3D plot from a function
3D plot from a matrix

Multilayer Plots

Building a multilayer plot panel
Building a multilayer plot step by step

3. Command Reference

The File Menu

File-> New ->
File-> Recent Projects
File -> Open... (Ctrl-O)
File -> Open Excel...
File -> Open ODF Spreadsheet...
File-> Open Image File... (Ctrl-I)
File -> Append Project... (Ctrl-Alt-A)
File -> Close
File-> Convert files...
File-> Save Project (Ctrl-S)
File-> Save Project as... (Ctrl-Shift-S)
File-> Save Window as...
File -> Open Template...
File -> Save as Template...
File-> Print (Ctrl-P)
File-> Print Preview
File-> Print All Plots
File -> Export Graph
File -> Export
File -> Import
File -> Quit (Ctrl-Q)

The Edit Menu

Edit -> Undo (Ctrl-Z)
Edit -> Redo (Ctrl-Shift-Z)
Edit -> Cut Selection (Ctrl-X)
Edit -> Copy Selection (Ctrl-C)
Edit -> Copy Selection (full precision)
Edit -> Delete Selection (Del)
Paste ->
Edit -> Delete Fit Tables
Edit -> Clear Log Information
Edit -> Preferences...

The View Menu

View -> Toolbars... (Ctrl-Shift-T)
View -> Project Explorer (Ctrl-E)
View -> Results log
View -> Undo/Redo Stack...
View -> Quick Help
View -> Console
View -> Serial Monitor...

The Scripting Menu

General Scripting Commands
Notes Specific Scripting Commands

The Graph Menu

Graph -> Add/Remove Curves... (Alt-C)
Graph -> Add Error Bars... (Ctrl-B)
Graph -> Add Function... (Ctrl-Alt-F)
Graph -> Add Function 2D... (Ctrl-Alt-2)
Graph -> Rescale To Show All (Ctrl-Shift-R)
Graph -> Exchange X-Y Axes
Graph -> New Legend (Ctrl-L)
Graph -> New Table...
Graph -> Add Color Scale
Graph -> Add Equation... (Alt-Q)
Graph -> Add Text (Alt-T)
Graph -> Draw Arrow (Ctrl-Alt-A)
Graph -> Draw Line (Ctrl-Alt-L)
Graph -> Add Rectangle (Ctrl-Alt-R)
Graph -> Add Ellipse (Ctrl-Alt-E)
Graph -> Add Time Stamp (Ctrl-Alt-T)
Graph -> Add Image (Alt-I)
Graph -> View Pixel Line Profile...
Graph -> Add Central Axis
Graph -> Add Reference Line...
Z-Order Commands...
Graph -> Add Layer (Alt-L)
Graph -> Add Empty Inset Layer
Graph -> Add Inset Layer With Curves
Graph -> Arrange Layers... (Shift-A)
Graph -> Automatic Layout command
Graph -> Fit Layers to Window
Graph -> Fit Window to Layers
Graph -> Extract to Layers command
Graph -> Extract to Graphs... command
Graph -> Merge Graph Windows... command
Graph -> Remove Layer (Alt-R)

The Plot Menu

Plot Wizard (Ctrl-Alt-W)
Line ->
Symbol ->
Line + Symbol ->
Column/Bar/Pie ->
Multi-Curve ->
Area ->
Special Line/Symbol ->
Statistical Graphs ->
Panel ->
3D XYY ->
3D Plot ->

The 3D Plot menu

3D Wire Frame
3D Hidden Lines
3D Polygons
3D Wire Surface
Bars
Scatter
Contour+Color Fill
Countour Lines
Countour Lines - Color Mapped
Gray Scale Map
Heat Map

The Data Menu

Data -> Disable tools
Data -> Zoom In/Out and Drag Canvas
Data -> Zoom/Drag Canvas Horizontally
Data -> Zoom/Drag Canvas Vertically
Data -> Zoom in (Ctrl-+)
Data -> Zoom out (Ctrl--)
Data -> Select Data Range (Alt-S)
Data -> Data Reader (Ctrl-D)
Data -> Annotation
Data -> Screen Reader
Data -> Vertical Cursor...
Data -> Draw Data Points
Data -> Move Data points (Ctrl-Alt-M)
Data -> Remove Bad Data Points (Alt-B)
Data -> Remove Bad Data Points

The Analysis Menu

Commands for the analysis of data in tables
Commands for the analysis of curves in plots
Commands for the analysis of data in matrices

The Statistics Menu

Descriptive Statistics
Hypothesis-Testing
ANOVA
Nonparametric Tests

The Table Menu

Set Column As
Column Options...
Set Column Values...
Recalculate
Fill column with
Clear
Delete Columns
Clear Selection
Add Column
Insert Column
Columns...
Duplicate Columns
Hide Selected Columns
Show All Columns
Alignment
Adjust Column Width
Move to First
Move Left
Move Right
Move to Last
Swap columns
Rows...
Delete Rows Interval...
Insert Row
Move Row
Go to Row... (Ctrl-Alt-G)
Go to Column... (Ctrl-Alt-C)
Extract Data...
Convert to Matrix

The Matrix Menu

Set Properties...
Set Dimensions... (Ctrl-D)
Set Values... (Ctrl-Q)
Recalculate (Ctrl-Return)
Rotate 90 (Ctrl-Shift-R)
Rotate -90 (Ctrl-Alt-R)
Flip V (Ctrl-Shift-V)
Flip H (Ctrl-Shift-H)
Expand...
Shrink...
Smooth
Transpose
Invert
Determinant
Go To Commands
View Commands
Palette
Show Column/Row (Ctrl-Shift-C)
Show X/Y (Ctrl-Shift-X)
Convert to Spreadsheet

The Format Menu

Apply Template...
Copy Format (Shift-F)
Set As Default
Edit Range...
Plot Associations...
Plot...
Curves...
Scales...
Axes...
Grid...
Title...

The Windows Menu

Folders
Cascade
Tile
Next (F5)
Previous (F6)
Find...
Rename Window
Copy Window (Shift-W)
Duplicate
Script Window (F3)
Window Geometry...
Hide Window
Close Window (Ctrl-W)
Numbered Window List

The Help Menu

Help
Choose Help Folder...
QtiPlot Homepage
Download Manual
Search for Updates...
Changelog...
About QtiPlot... (F1)

Customization of 3D plots

Frame
Box
No axes
Front Grid
Back Grid
Left Grid
Right Grid
Ceiling Grid
Floor Grid
Enable perspective
Reset rotation
Fit frame to window
Bars Style
Dots
Cones
Cross Hairs
3D Wire Frame
3D Hidden Lines
3D Polygons
3D Wire Surface
Floor Data Projection
Floor Isolines
Empty Floor
Animation

4. The Toolbars

The Edit Toolbar
The File Toolbar
The Plot Toolbar
The Layers Toolbar
The Table Toolbar
The Column Toolbar
The Plot 3D Toolbar

5. The Dialogs

Folder Properties Dialog

Window Properties Dialog

Add Custom Action

Custom Color Map

Set Equidistant Levels

Gradient Fill

Add Error bars

Function Dialog

Function 2D Dialog

Add/Remove Curves

Arrange Layers

Graph Manipulation

Line Options

Line Tab
Arrow Head Tab
Geometry Tab
Axes Tab
Name Tab

Color Scale Dialog

Color Bar Scale Tab
Axis Tab
Title Tab
Fill Pattern Tab
Frame Tab
Geometry Tab
Name Tab

Reference Line Options

Image Options

Image Tab
Frame Tab
Geometry Tab

Column Options

Plot Associations

Edit Curve Range

Plot Details

Vertical Cursor

Define surface plot

Export Graph Dialog

Fast Fourier Transform Dialog

FFT Filter Dialog

Find Peaks Dialog

Frequency Count Dialog

Bland-Altman Plot Dialog

Data Tab
Lines Tab
Output Settings Tab

Q-Q Plot Dialog

Normality Test (Shapiro-Wilk) Dialog

One sample t-Test Dialog

Two sample t-Test Dialog

Chi-square Test Dialog

One-way ANOVA Dialog

Post-hoc tests

Two-way ANOVA Dialog

Post-hoc tests

Kruskal-Wallis ANOVA Dialog

Mood's Median Test Dialog

Friedman ANOVA Dialog

One Sample Wilcoxon Signed Rank Test Dialog

Sign Test Dialog

Paired Sample Wilcoxon Signed Rank Test Dialog

Two Sample Kolmogorov-Smirnov Test Dialog

Mann-Whitney Test Dialog

Smoothing Options

Baseline Dialog

Math on Data Sets Dialog

Average Multiple Curves Dialog

Convex Hull Dialog

Intersections Dialog

Rectangle Tab
Options Tab
Custom Output Tab

Integration Options

Integrate Function Dialog

Linear Fit Options

Polynomial Fit Options

Multiple Linear Regression Dialog

Fit Exponential Decay - First Order

Fit Exponential Decay - Second Order

Fit Exponential Decay - Third Order

Fit Exponential Growth Dialog

The Fit Wizard

Select Function Tab
Fitting Session Tab
Custom Output Tab

Help Window

General Plot Options

Scale Tab
Grid Tab
Axis Tab
Special Ticks Tab
General Tab

The Plot Wizard

Project Explorer Find Dialog

Preferences Dialog

General Preferences
Tables Preferences
2D Plot Preferences
3D Plot Preferences
Notes Preferences
Fitting Preferences

Serial Port Settings

Serial Monitor

Printer-setup

Set Column Values

Extract Data

Set Matrix Dimensions

Resample Matrix Dialog

Matrix Properties

Set Matrix Values

Bin Matrix Dialog

Regular XYZ Gridding Dialog

Random XYZ Gridding Dialog

Surface plot options

General Tab
Axes Tab
Grids Tab
Planes Tab
Lighting Tab
View Tab
Stack Tab
Scale Tab
Axis Title Tab
Axis Tab
Grid Tab
Text Tab
Position Tab
Legend Tab
Color Scale Tab
Axis Tab
Title Tab
Geometry Tab
Legend Tab
Group Edit Tab
Format Tab
Colors Tab
Projection Tab
Labels Tab
Drop Lines Tab
Geometry Tab
Normals Tab
Offset Tab
Vector Tab

Sorting Options

Tex Equation Editor

Text Tab
Frame Tab
Geometry Tab
LaTeX Preamble Tab

Text options

Text
Frame
Symbol
Name

Open Project Dialog

Open Template Dialog

Export ASCII Dialog

Import ASCII files

Convert files

Import database

Open Matlab File

Open TDMS File

6. Analysis of data and curves

Fast Fourier Transform

Correlation

Convolution

Deconvolution

Data Fitting

Fitting algorithms
Weighted data fitting
Goodness-of-Fit Statistics
Confidence interval for the fit parameters
Confidence bands
Prediction bands

Fitting to specific curves

Fitting to a line
Fitting to a polynomial
Fitting to a Boltzmann function
Fitting to a Logistic function
Fitting to a Gauss function
Fitting to a Lorentz function
Fitting to a PsdVoigt1 function
Fitting to a PsdVoigt2 function

User defined fit models

Multi-Peaks fitting

Multiple Linear Regression Model

Filtering of data curves

FFT low pass filter
FFT high pass filter
FFT band pass filter
FFT block band filter

Interpolation

7. Mathematical Expressions and Scripting

The Initialization File
Python Basics
Defining Functions and Control Flow
Mathematical Functions
Accessing QtiPlot's objects from Python
User settings
Project files
Project folders
Working with Tables
Linear Color Maps
Working with Matrices
Table/Matrix conversion
Stem Plots
2D Plots
3D Plots
Data Analysis
Statistics
Working with Notes
Using PyQt's dialogs and classes
Using Qt Designer for easy creation of custom user dialogs
Task automation example
Scope Changes
QtiPlot/Python API
PyQt Class Reference

8. Acknowledgements

MPFIT: A MINPACK-1 Least Squares Fitting Library in C

Minpack Copyright Notice (1999) University of Chicago. All rights reserved

9. Frequently asked questions

List of Tables
4-1. Edit toolbar commands.
4-2. File toolbar commands.
4-3. New Window/Folder Commands
4-4. New Function/Surface Commands
4-5. Open Commands
4-6. Plot toolbar commands
4-7. Plot Toolbar Zoom Commands
4-8. Read Data Commands
4-9. Edit Data Commands
4-10. Add Text Commands
4-11. Add Line/Arrow Commands
4-12. Geometric Shape Commands
4-13. Image Commands
4-14. Z-order Commands
4-15. Align Objects Commands
4-16. Layers toolbar commands
4-17. Add Layer Commands
4-18. Add Axis Commands
4-19. Fit Layers Commands
4-20. Extract/Merge Layers Commands
4-21. Table toolbar commands.
4-22. Line Plots
4-23. Scatter Plots
4-24. Line & Symbol Plots
4-25. Bar Chart Plots
4-26. Statistical Plots
4-27. Vector Plots
4-28. Special Line/Symbol Plots
4-29. 3D Plots
4-30. Column toolbar commands.
4-31. 3D Plot toolbar commands.
5-1. Syntax specifiers for the components of a box chart.
7-1. muParser: Predefined Fundamental Physical Constants in the standard MKSA unit system
7-2. muParser: Supported Mathematical Operators
7-3. muParser: Mathematical Functions
7-4. muParser: Other functions
7-5. Python: Supported Mathematical Functions

List of Figures
1-1. Starting QtiPlot in French from a macOS terminal.
1-2. A typical QtiPlot session
1-3. The QtiPlot table
1-4. Working with Excel workbooks in QtiPlot
1-5. Context menu for Excel workbooks
1-6. Properties dialog for Excel workbooks
1-7. The QtiPlot matrix
1-8. An example of QtiPlot 2D graph
1-9. The QtiPlot Note Window
1-10. The QtiPlot Results Log window
1-11. The QtiPlot Project Explorer
1-12. The Quick Help Window
1-13. The Scripting Console
1-14. Export QtiPlot windows/projects as Origin C files
1-15. OriginLab - Create new custom menu
1-16. OriginLab - New custom menu
1-17. OriginLab - New custom menu item
1-18. OriginLab - Import script
1-19. OriginLab - Select C file generated by QtiPlot
2-1. A simple 2D plot: the table.
2-2. A simple 2D plot: the default plot.
2-3. A simple 2D plot: the plot finished.
2-4. A 2D plot with two Y axes.
2-5. Direct plot of a function.
2-6. Function plot: filling of the X column.
2-7. Function plot: filling of the Y column.
2-8. Example of a 3D Plots.
2-9. Definition of a new surface 3D plot
2-10. The 3D surface plot created using defaults
2-11. The 3D surface plot after customization.
3-1. The result of the View Pixel Line Profile... command.
3-2. The FFT Filter -> Low Pass... dialog.
3-3. The FFT Filter -> High Pass... dialog.
3-4. The FFT Filter -> Band Pass... dialog.
3-5. The FFT Filter -> Band Block... dialog.
3-6. The Interpolate... dialog.
4-1. The QtiPlot Edit Toolbar
4-2. The QtiPlot File Toolbar
4-3. The QtiPlot Plot Toolbar
4-4. The QtiPlot Layers Toolbar
4-5. The QtiPlot Table Toolbar
4-6. The QtiPlot Column Toolbar
4-7. The QtiPlot Plot 3D Toolbar
5-1. The folder properties dialog box.
5-2. The Rename Window dialog box.
5-3. The Add Custom Script Action... dialog box.
5-4. The Custom Color Map dialog box.
5-5. Set Equidistant Levels dialog box.
5-6. The One Color mode of the Gradient Fill dialog box.
5-7. The Two Colors mode of the Gradient Fill dialog box.
5-8. The Three Colors mode of the Gradient Fill dialog box.
5-9. The Custom Color Map mode of the Gradient Fill dialog box.
5-10. The Palette mode of the Gradient Fill dialog box.
5-11. The Colormap files mode of the Gradient Fill dialog box.
5-12. Example of a plot with both X and Y Error Bars.
5-13. The Add Function... dialog box: Cartesian Coordinates.
5-14. The Add Function... Dialog Box: Automatic Detection of Constants.
5-15. The Add Function... dialog box: Parametric Coordinates.
5-16. The Add Function... dialog box: Polar Coordinates.
5-17. The Function 2D dialog box.
5-18. The Add Layer Dialog Box.
5-19. The Add/Remove Curves... Dialog Box.
5-20. The Add/Remove Curves... dialog box for 3D plot windows.
5-21. The Arrange Layers... dialog: the Geometry Tab
5-22. Example of a vertical arrangement for two plots.
5-23. The Graph Manipulation dialog used for extracting individual layers from 2D graph windows.
5-24. The Graph Manipulation dialog used for merging 2D graph windows.
5-25. The Line Options Dialog: Line Tab
5-26. The Line Options Dialog: Arrow Head Tab
5-27. The Line Options Dialog: Geometry Tab
5-28. The Line Options Dialog: Axes Tab
5-29. The Line Options Dialog: Name Tab
5-30. The Color Scale Dialog: Color Bar Scale Tab
5-31. The Color Scale Dialog: Axis Tab
5-32. The Color Scale Dialog: Title Tab
5-33. The Color Scale Dialog: Fill Pattern Tab
5-34. The Color Scale Dialog: Frame Tab
5-35. The Color Scale Dialog: Geometry Tab
5-36. The Color Scale Dialog: Name Tab
5-37. The reference Line Options dialog for Value-based lines.
5-38. The reference Line Options dialog for Statistics-based lines.
5-39. The Image Options Dialog: Image Tab
5-40. The Image Options Dialog: Frame Tab
5-41. The Image Options Dialog: Geometry Tab
5-42. The Column Options... Dialog.
5-43. The Plot Associations Dialog.
5-44. The Edit Curve Range Dialog.
5-45. The Plot Details Dialog: Dimensions tab.
5-46. The Plot Details Dialog: Print tab.
5-47. The Plot Details Dialog: Fonts tab.
5-48. The Plot Details Dialog: Miscellaneous tab.
5-49. The Plot Details Dialog: Display tab.
5-50. The Plot Details Dialog: Legends/Titles tab.
5-51. The Plot Details Dialog: Layer properties.
5-52. The Plot Details Dialog: Canvas with a solid background color.
5-53. The Plot Details Dialog: Canvas with a background image.
5-54. The Plot Details Dialog: Canvas geometry.
5-55. The Plot Details Dialog: Layer Speed Mode.
5-56. The Plot Details Dialog: Layer Display.
5-57. The Plot Details Dialog: Layer Display.
5-58. The Plot Details Dialog: Group Edit tab.
5-59. Context menu of a plot layer.
5-60. The Plot Details Dialog: Assign Axes.
5-61. The Plot Details Dialog: Line formatting.
5-62. The Plot Details Dialog: Standard Symbol formatting.
5-63. The Plot Details Dialog: Unicode Symbol formatting.
5-64. The Plot Details Dialog: Image Symbol formatting.
5-65. The Plot Details Dialog: Labels formatting.
5-66. The Plot Details Dialog: Offset formatting.
5-67. The Plot Details Dialog for formatting error bars.
5-68. The Plot Details Dialog for pies: Pie Segment Formatting.
5-69. The Plot Details Dialog for pies: Pie Geometry.
5-70. The Plot Details Dialog for pies: Pie Labels Formatting.
5-71. The Plot Details Dialog for pies: Pie Colors Formatting.
5-72. The Plot Details Dialog for box and hiskers formatting.
5-73. The Plot Details Dialog for box: Percentile Formatting.
5-74. The Plot Details Dialog for outliers and extreme values formatting.
5-75. The Plot Details Dialog for box: Data Formatting.
5-76. The Plot Details Dialog: distribution options.
5-77. The Plot Details Dialog for box: lines options.
5-78. The Plot Details Dialog for box: connect options.
5-79. The Plot Details Dialog: ridgeline display options.
5-80. The Plot Details Dialog for Column, Bar and Histogram curves: Spacing tab.
5-81. The Plot Details Dialog for Box curves: Spacing tab.
5-82. The Plot Details Dialog for histograms: Data Formatting.
5-83. The Plot Details Dialog for Vector XYXY curves.
5-84. The Plot Details Dialog for Vector XYAM curves.
5-85. The Values tab.
5-86. The Colors tab.
5-87. Set Equidistant Levels dialog box.
5-88. The Two Colors mode of the Gradient Fill dialog box.
5-89. The Custom Color Map mode of the Gradient Fill dialog box.
5-90. The Palette mode of the Gradient Fill dialog box.
5-91. The Contour Lines tab.
5-92. The Plot Details Dialog for curve analysis operations.
5-93. Context menu for a Lorentz data fit analysis operation.
5-94. The Vertical Cursor... dialog box.
5-95. The New -> New Function Plot -> New 3D Surface Plot... dialog box.
5-96. The New -> New Function Plot -> New 3D Surface Plot... dialog box.
5-97. The FFT... dialog box for a curve.
5-98. The FFT... dialog box for a table.
5-99. The FFT... dialog box for a matrix.
5-100. The FFT Filter -> Low Pass... dialog.
5-101. The FFT Filter -> High Pass... dialog.
5-102. The FFT Filter -> Band Pass... dialog.
5-103. The FFT Filter -> Band Block... dialog.
5-104. The FFT Filter Dialog dialog box for a matrix.
5-105. The Find Peaks dialog box.
5-106. The Frequency Count dialog.
5-107. Bland-Altman Plot... dialog: Data tab for single measurements.
5-108. Bland-Altman Plot... dialog: Data tab with Subject column for repeated measurements.
5-109. Bland-Altman Plot... dialog: Lines tab.
5-110. Bland-Altman Plot... dialog: Output Settings tab.
5-111. The Frequency Count dialog.
5-112. The Normality Test (Shapiro-Wilk) dialog.
5-113. One sample t-Test dialog.
5-114. Two sample t-Test dialog.
5-115. The Chi-square Test for Variance dialog.
5-116. The one-way ANOVA dialog.
5-117. The two-way ANOVA dialog.
5-118. The Kruskal-Wallis ANOVA dialog.
5-119. The Mood's median test dialog.
5-120. The Friedman ANOVA dialog.
5-121. The one sample Wilcoxon signed rank test dialog.
5-122. The paired sample sign test dialog.
5-123. The paired sample Wilcoxon signed rank test dialog.
5-124. The two sample Kolmogorov-Smirnov test dialog.
5-125. The two sample Mann-Whitney test dialog.
5-126. Comparison of the curve smoothing methods available in QtiPlot applied to a simulated sine curve with added white noise.
5-127. The Math on Data Sets dialog.
5-128. The Average Multiple Curves dialog.
5-129. The Convex Hull Dialog
5-130. The Intersections Dialog: Rectangle tab
5-131. The Intersections Dialog: Options tab.
5-132. The Intersections Dialog: Custom Output tab.
5-133. The Integration Options dialog box for curves.
5-134. The Integration Options dialog box for tables.
5-135. The Integrate Function... dialog box.
5-136. The Linear Fit Options dialog box.
5-137. The Polynomial Fit Options dialog box.
5-138. The Multiple Linear Regression dialog box.
5-139. The Fit Exponential Decay options dialog box.
5-140. The Fit Exponential Decay Second Order dialog box.
5-141. The Fit Exponential Decay Third Order dialog box.
5-142. The Fit Exponential Growth options dialog box.
5-143. The first step of the Fit Wizard... dialog box.
5-144. The Fit Wizard... dialog box: providing initial guesses for the fit parameters.
5-145. The Fit Wizard... dialog box: choosing the input data set(s).
5-146. The Fit Wizard... dialog box: choosing the fit algorithm.
5-147. The third step of the Fit Wizard... dialog box.
5-148. Help browser window.
5-149. General plot options dialog: The Scale Tab.
5-150. General plot options dialog: The Grid Tab.
5-151. General plot options dialog: The Axis Tab.
5-152. General plot options dialog: The Special Ticks Tab.
5-153. General plot options dialog: General Settings.
5-154. The plot wizard dialog box.
5-155. The project explorer find dialog.
5-156. The preferences dialog: general parameters for the application.
5-157. The Preferences dialog: Confirmations tab.
5-158. The Preferences dialog: Colors tab.
5-159. The Preferences dialog: Numeric Format tab.
5-160. The preferences dialog: File Locations Tab.
5-161. The preferences dialog: Keyboard Tab.
5-162. The preferences dialog: Internet Connection Tab.
5-163. The Preferences dialog: table options.
5-164. The Preferences dialog: descriptive statistics options.
5-165. The preferences dialog: 2D plot options.
5-166. The Preferences dialog: Curves Tab.
5-167. The Preferences dialog: Symbol Tab.
5-168. The Preferences dialog: Error Bars Tab.
5-169. The Preferences dialog: Axes Tab.
5-170. The Preferences dialog: Ticks Tab.
5-171. The Preferences dialog: Grid Tab.
5-172. The Preferences dialog: Geometry Tab.
5-173. The Preferences dialog: Speed Tab.
5-174. The Preferences dialog: Fonts Tab.
5-175. The Preferences dialog: Print Tab.
5-176. The preferences dialog: 3D plot options tab.
5-177. The Preferences dialog: 3D curves tab.
5-178. The Preferences dialog: 3D axes tab.
5-179. The Preferences dialog: 3D grids tab.
5-180. The Preferences dialog: 3D planes tab.
5-181. The Preferences dialog: 3D colors tab.
5-182. The Preferences dialog: 3D fonts tab.
5-183. The preferences dialog: note options.
5-184. The preferences dialog: fitting options.
5-185. The Serial Port Settings dialog.
5-186. The Serial Monitor Window
5-187. The Print dialog.
5-188. The Set Column Values... dialog.
5-189. The Extract Data... dialog.
5-190. The Set Dimensions... dialog for matrix.
5-191. The Resample Matrix Dialog dialog for a matrix.
5-192. The Set Properties... dialog for matrices.
5-193. The Set Values... dialog for matrix.
5-194. The Bin Matrix Dialog dialog box.
5-195. Scatter plot showing the number the data points falling within each 2D bin.
5-196. The Regular XYZ Gridding dialog box: XY data grid preview.
5-197. The Regular XYZ Gridding dialog box: 3D surface preview.
5-198. The Shepard's interpolation method.
5-199. The Random XYZ Gridding dialog box.
5-200. The general 3D plot options tab.
5-201. The general 3D plot axes tab.
5-202. The general 3D plot grids tab.
5-203. The general 3D plot planes tab.
5-204. The general 3D plot lighting tab.
5-205. The general 3D plot view tab.
5-206. The general 3D plot stack tab.
5-207. The surface plot options dialog box.
5-208. The 3D color scale tab.
5-209. The 3D color scale axis tab.
5-210. The 3D color scale title tab.
5-211. The 3D color scale geometry tab.
5-212. The 3D legend tab.
5-213. The 3D legend tab.
5-214. The 3D bars/symbols offset tab.
5-215. The 3D Vector options tab.
5-216. The Sorting Options Dialog.
5-217. The Tex Equation Editor: using a rendering web service.
5-218. The Tex Equation Editor: using the built-in LaTeX parser.
5-219. The Tex Equation Editor: compilation of complete LaTeX documents.
5-220. The Tex Equation Editor: LaTeX preamble tab.
5-221. The axis title options dialog.
5-222. The legend/text options dialog.
5-223. The legend frame options tab.
5-224. The legend symbol options tab.
5-225. The legend name tab
5-226. Opening of a QtiPlot project (.qti) file.
5-227. Opening of a QtiPlot Window Template (.qwt) file.
5-228. Export of a selection from a table to an ASCII file.
5-229. The dialog box.
5-230. Convert OPJU files dialog.
5-231. SQL database table/view selection with query dialog.
5-232. Database table/view selection dialog on Linux and macOS systems.
5-233. The Open Matlab File dialog box.
5-234. The Matlab variable properties dialog.
5-235. The Open TDMS File dialog box.
5-236. The TDMS channel properties dialog.
6-1. An example of the FFT.
6-2. An example of a correlation between two sine functions.
6-3. The results shown in the log window after a data fit operation.
6-4. The results of a Fit Linear (Default).
6-5. The results of Fit Polynomial....
6-6. The results of Fit Boltzmann (sigmoidal).
6-7. The results of Fit Logistic compared to Fit Boltzmann (sigmoidal).
6-8. The results of Fit Gaussian.
6-9. The results of Fit Lorentzian.
6-10. The results of Fit Pseudo-Voigt -> PsdVoigt2....
6-11. The results of a non-linear fit using a custom Gauss function: y(x) = A*exp(-(x-xc)^2/(2*w^2)).
6-12. The results of a Fit Multi-peak -> Lorentzian....
6-13. Information dialog allowing to launch the Fit Wizard.
6-14. Signal after a FFT low pass filter
6-15. Signal after a FFT high pass filter
6-16. Signal after a FFT band pass filter
6-17. Signal after a FFT block band filter
6-18. Comparison of the three methods of interpolation

List of Equations
6-1. Fourier equation
6-2. Covariance function of two signals x(t) and y(t)
6-3. Boltzmann equation
6-4. Logistic dose response equation
6-5. Gauss equation
6-6. Lorentz equation
6-7. PsdVoigt1 equation
6-8. PsdVoigt2 equation

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