Axis 282 Bedienungsanleitung PDF herunterladen (Seite 32)

Chapter II-12 — Graphs

II-264

The “Cap width” setting sets the width of the cap on the end of an error bar as an integral number of points.

You can also set the “Cap width” to “auto” (or to zero) in which case Igor picks a cap width appropriate for

the size of the graph. In this case the cap width is set to twice the size of the marker plus one. For best results

the cap width should be an odd number.

For any mode you can set the thickness of the cap and the thickness of the error bar. The units for these set-

tings are points. These can be fractional numbers. Although only integral thicknesses can be displayed on

the screen, nonintegral thicknesses are properly produced on high resolution hard-copy devices. If you set

“Cap thickness” to zero no caps are drawn. If you set “Bar thickness” to zero no error bars are drawn.

If you enable the “XY Error box” checkbox then a box is drawn rather than an error bar to indicate the region

of uncertainty. No box is drawn for points for which one or more of the error values is NaN.

Here is a simple example of a graph with error bars.

The top trace used the “+/- Wave” mode with only a +wave. The last value of the error wave was made neg-

ative to reverse the direction of the error bar.

Customize at Point

You can customize the appearance of individual points on a trace in a graph displayed in bar, marker, dot

and lines to zero modes. To do this interactively, right click on the desired point on a trace and choose Cus-

tomize at Point from the contextual menu. The Modify Trace dialog will appear with an entry in the trace

list shown with the point number in square brackets. When such an entry is selected, only those properties

that can be customized will be available in the dialog. This feature was added in Igor Pro 6.20.

Modifying Axes

You can modify the style of presentation of each axis in a graph by choosing Modify Axis from the Graph

menu or by double-clicking directly on an axis. This brings up the Modify Axis dialog.

The precise appearance of the Modify Axis dialog depends on current axis settings such as whether the axis

is linear, log, or a category axis and also on whether you specify tick mark positions manually or allow Igor

to automatically choose them. This is what it looks like the first time you display the dialog, with a linear

numeric axis and automatic ticking. The dialog remembers which tab you used last and displays that tab,

so it may not look like the picture.

2.5

2.0

1.5

1.0

0.5

0.0

-0.5

1.41.21.00.80.60.40.20.0-0.2

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 79 80

Keine Kommentare

Axis 282 Bedienungsanleitung Seite 32