Axis 282 Uživatelský manuál stáhnout pdf (Strana 14)

Chapter II-12 — Graphs

II-246

Manual Axis Ranges

When a graph is first created, it is in autoscaling mode. In this mode, the axis limits automatically adjust to

just include all the data. You can set the axis limits to fixed values by selecting the Manual Min and Manual

Max checkboxes. When you select one of these checkboxes, both are automatically selected. You can elect

to fix just one end of an axis range by de-selecting one of these checkboxes. The other end will then be

adjusted by Igor to include the minimum or maximum value of the data.

The fixed limits are set by editing the values in the boxes below the Manual Min and Manual Max check-

boxes. Initially these boxes are set to the automatic values of the limits.

There are a number of other ways to set the Min and Max limits. Clicking the Expand 5% button expands

the range between the min and the max by 5 percent. This has the effect of shrinking the graph traces plotted

on the axis by 5%. Clicking the Swap button exchanges the Min and Max parameters. This has the effect of

reversing the ends of the axis. You can plot waves upside-down or backwards. This works for linear, log

and date/time axes. If you don’t want the axis limits to be fixed, use the Reverse Axis checkbox in the

Autoscale Settings area.

An additional way to set the Min and Max parameters is to select a wave from the list and use the Quick

Set buttons. If you click the X Min/Max quick set button then the minimum and maximum X values of the

selected wave are transferred to the parameter boxes. If you click the Y Min/Max quick set button then the

minimum and maximum Y values of the selected wave are transferred to the parameter boxes. If you spec-

ified the full scale Y values for the wave then you can click the Full Scale quick set button. This transfers the

wave’s Y full scale values to the parameter boxes. The full scale Y values can be set using the Change Wave

Scaling item in the Data menu.

Automatic Axis Ranges

When the Manual Min and Manual Max checkboxes are not selected the given axis is in autoscaling mode.

In this mode the axis limits are determined by the data values in the waves displayed using the selected

axis. The items inside the Autoscale box control the method used to determine the axis range:

You can cause an autoscaled axis to be reversed by selecting the “Reverse axis” checkbox.

Autoscale mode usually sets the axis limits using all the data in waves associated with the traces that use

the axis. This can be undesirable if the associate horizontal axis is set to display only a portion of the total

X range. Select the Autoscale Only Visible Data checkbox to have Igor use only the data included within the

horizontal range for autoscaling.

Overall Graph Properties

You can specify certain overall properties of a graph by choosing Modify Graph from the Graph menu. This

brings up the Modify Graph dialog. You can also get to this dialog by double-clicking in any blank area

outside the plot rectangle.

Forces the end of the axis that is closest to zero to be

exactly zero.

The default mode. Axis range is set to the minimum and

maximum data values of all waves plotted using this axis.

Extends axis range to the next major tick mark.

Like “Round to nice values” but also ensures that traces

are inset from the ends of the axis.

The default mode.

Forces zero to be in the middle of the axis range.

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