Axis 282 Instrukcja Użytkownika Pobierz pdf (Strona 7)

Chapter II-12 — Graphs

II-239

In fact, you can display a wave more than once in a graph by using the More Choices button or the Append

Traces to Graph dialog. Igor distinguishes among the traces by a trace instance name such as “myWave#1”,

which is a kind of trace name that you will see Igor use when modifying graphs containing waves displayed

more than once. See Instance Notation on page IV-16 and the ModifyGraph operation on page V-410.

Normally the data values of the waves that you select in the Y Wave(s) list are plotted versus their calcu-

lated X values. This is called the waveform plotting mode. The calculated X values are derived from the

wave’s X scaling; see Waveform Model of Data on page II-77.

If you want to plot the data values of the Y waves versus the data values of another wave, select the other

wave in the X Wave list. This is called the XY plotting mode. In this mode, X scaling is ignored; see XY

Model of Data on page II-78.

If the lengths of the X and Y waves are not equal, then the number of points plotted is determined by the

shorter of the waves. You can pick only a single X wave to service all the Y data waves. If you have multiple

XY pairs, you will need to use the alternate form of this dialog as described later in this section.

If you want you can specify a title for the new window. The title is not used except to form the title bar of

the window. It is not used to identify windows and does not appear in the graph. If you specify no title, Igor

will choose an appropriate title based on the traces in the graph and the graph name. Igor automatically

assigns graph names of the form “Graph0”. The name of a window is important because it is used to iden-

tify windows in command line operations. The title is not important to Igor.

If you have created style macros for the current experiment they will appear in the Style pop-up menu. See

Graph Style Macros on page II-305 for details.

Normally, the new graph will be created using left and

bottom axes. You can select other axes using the pop-up

menus under the X and Y wave lists. Picking L=Vert-

Crossing will automatically select B=HorizCrossing and

vice versa. These free axes are used when you want to

create a Cartesian type plot where the axes cross at (0,0).

You can create additional free axes by choosing New

from the pop-up menu. Additional axes can be added to

these pop-ups by capturing axes preferences; see Graph Preferences on page II-303.

Axes created with the New Free Axis dialog are called “free axes” because they can be freely positioned

nearly anywhere in the graph window. The standard left, bottom, right, and top axes are always at the edge

of the plot area.

You should give the new axis a name that describes its intended use. The name must be unique within the

current graph and can’t contain spaces or other nonalphanumeric characters. The Left and Right radio

buttons determine the side of the axis on which tick mark labels will be placed. They also define the edge

of the graph from which axis positioning is based. See Modifying Axes on page II-264 for further details.

You can create a blank graph window containing no traces or axes by clicking the Do It button without selecting

any Y waves to plot. The New Contour Plot and New Image Plot dialogs create a blank graph window and then

append a contour or image plot to it. Blank graph windows are sometimes useful for programmers and, in con-

junction with drawing tools, for the creation of pure drawings, perhaps for inclusion in a page layout.

The New Graph dialog comes in two versions. The simpler version shown above is suitable for most pur-

poses. If, however, you have multiple pairs of XY data or when you will be using more than one pair of axes,

you can click the More Choices button to get a more complex version of the dialog.

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