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Chapter II-12 — Graphs

II-238

The Target Window

Operations that apply only to graphs (such as ModifyGraph and ShowInfo) affect the top-most graph

window. Operations that apply to any window (such as Modify) affect the target window.

Typing in Graphs (Macintosh)

If you type on the keyboard while a graph is the top window, Igor brings the command window to the front

and your typing goes into the command line. (The only exception to this is when a graph contains a selected

SetVariable control.)

Graph Names

Every graph that you create has a graph name which you can use to manipulate the graph from the

command line or from a macro. When you create a new graph, Igor assigns it a name of the form “Graph0”,

“Graph1” and so on. When you close a graph, Igor offers to create a window recreation macro which you

can invoke later to recreate the graph.

The name of the window recreation macro is the same as the name of the graph. The graph name is not the same

as the graph title which is the text that appears in the graph’s window frame. You can change a graph’s name

and title with the Window Control dialog, accessed by pressing Command-Y (Macintosh) or Ctrl+Y (Windows).

Creating Graphs

You create a graph by choosing New Graph from the Windows menu.

You can also create a graph by choosing New Category Plot, New Contour Plot or New Image Plot from

the New submenu in the Windows menu.

Here is the simple version of the New Graph dialog:

You select the wave(s) to be displayed in the graph from the Y Wave(s) list. The wave is displayed as a trace

in the graph; by default the trace is a segmented line joining the Y values of the wave. Sometimes we refer

to traces as waves, though a trace is actually just a representation of the wave.

Click if you have multiple XY pairs, if you need several

pairs of axes, or if you want to plot a subset of a wave.

When selected, Y values are plotted on the horizontal axis.

Pick waves containing

Y data. Shift-click for

multiple selections.

Pick wave containing

X values or pick

_calculated_ for

waveform data

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Axis 282 Bedienungsanleitung Seite 6