Axis 282 Uživatelský manuál stáhnout pdf (Strana 22)

Chapter II-12 — Graphs

II-254

Fills

For traces in the Bars and “Fill to zero” modes, Igor presents a choice of fill type. The fill type can be None,

which means the fill is transparent, Erase, which means the fill is white and opaque, Solid, or three patterns

of gray. You can also choose a pattern from a palette and can choose the fill types and colors for positive

going regions and negative going regions independently.

Here is a table of fill patterns with the corresponding numeric codes:

Bars

When Bars mode is used for a wave plotted on a normal continuous X axis (rather than a category axis, see

Chapter II-13, Category Plots), the bars are drawn from the X value for a given point up to but not including

the X value for the next point. Such bars are commonly called “histogram bars” because they are usually

used to show the number of counts in a histogram that fall between the two X values.

If you want your bars centered on their X values, then you should create a Category Plot, which is more

suited for traditional bar charts (see Chapter II-13, Category Plots). You can, however, adjust the X values

for the wave so that the flat areas appear centered about its original X value as for a traditional bar chart.

One way to do this without actually modifying any data is to offset the trace in the graph by one half the

bar width. You can just drag it, or use the Modify Trace Appearance dialog to generate a more precise offset

command. In our example, the bars are 0.5 X units wide:

ModifyGraph offset(wave0)={-0.25,0}

-3 -2 -1

0 1 2 3

wave0

wave0#1

Histogram mode

extends to X = 3.0

Last X value is 2.5

-3 -2 -1

0 1 2 3

wave0

wave0#1

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 79 80

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Axis 282 Uživatelský manuál Strana 22