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Chapter II-12 — Graphs

II-236

Overview

Igor graphs are simultaneously:

• Publication quality presentations of data.

• Dynamic windows for exploratory data analysis.

A single graph can contain one or more of the following:

The various kinds of plots can be overlaid in the same plot area or displayed in separate regions of the graph.

Igor also provides extensive control over stylistic factors such as font, color, line thickness, dash pattern, etc.

This chapter describes how to create and modify graphs, how to adjust graph features precisely to your liking

and how to use graphs for data exploration. Although some of the techniques are applicable to graphs of 2D

data (contours and images), this chapter focuses on graphs of 1D numeric waves. Other Igor Pro plot types

are described in Chapter II-13, Category Plots, in Chapter II-14, Contour Plots, and in Chapter II-15, Image

Plots. Surface plots, isosurface plots, 3D scatter plots and other complex types of three dimensional plots can

be made using the Gizmo extension. To get started with Gizmo, choose Windows→New→3D Plots→3D

Help.

The use of drawing tools along with techniques for graphically editing data can be found in Chapter III-3,

Drawing. User-defined buttons and other controls are described in Chapter III-14, Controls and Control

Panels. Fancy textboxes and other annotations are covered in Chapter III-2, Annotations, whereas the in’s

and out’s of exporting publication-quality graphics are located in Chapter III-5, Exporting Graphics (Mac-

intosh), or Chapter III-6, Exporting Graphics (Windows).

Graph Features

Igor graphs are smart. If you expand a graph to fill a large monitor screen, Igor will adjust all aspects of the

graph to optimize the presentation for the larger graph size. The font sizes will be scaled to sizes that look

good for the large format and the graph margins will be optimized to maximize the data area without fouling

up the axis labeling. If you shrink a graph down to a small size, Igor will automatically adjust axis ticking to

prevent tick mark labels from running into one another. If Igor’s automatic adjustment of parameters does not

give the desired effect, you can override the default behavior by providing explicit parameters.

Igor graphs are dynamic. When you zoom in on a detail in your data, or when your data changes, perhaps

due to data transformation operations, Igor will automatically adjust both the tick mark labels and the axis

labels. For example, before zooming in, an axis might be labeled in milli-Hertz and later in micro-Hertz. No

matter what the axis range you select, Igor always maintains intelligent tick mark and axis labels.

If you change the values in a wave, any and all graphs containing that wave will automatically change to

reflect the new values.

Waveform plots Wave data versus scaled point number

XY plots Y wave data versus X wave data

Category plots Numeric wave data versus text wave data

Image plots Display of a matrix of data

Contour plots Contour of a matrix or an XYZ triple

Axes Any number of axes positioned anywhere

Annotations Textboxes, legends and dynamic tags

Cursors To read out XY coordinates

Drawing elements Arrows, lines, boxes, polygons, pictures …

Controls Buttons, pop-up menus, readouts …

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