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Next: STatistics
Up: PLT Command Summary
Previous: SHow
Most PLT commands operate on `groups' of data points. The default
is for each vector of the input data to be in a separate group. For
the default mode, commands like COlor and MArker affect the
appearance of an entire vector. Using the SKip command, it is
possible to independently control the appearance of sub-sets of data
within a single vector. Thus, when using SKip, a single y vector
can be divided into several plot groups that can be independently
controlled with COlor, MArker, R Y1, etc. Currently, SKip
should only be used when the input data consists of two vectors as
the other vectors will not be plotted. Note, SKip cannot affect
whether a data point has an error associated with it.
SKip OFf
Each vector of the input data is plotted as a separate group
(default).
SKip Single
A new plotting group begins every time x-coordinate equals NO (the
no data flag) ONE or more consecutive times. SKip Single is useful
when you wish to plot different groups with different markers.
SKip Double
A new plotting group begins every time x-coordinate equals NO (the
no data flag) TWO or more consecutive times. SKip Double is useful
when you wish to plot different groups using lines that may contain
breaks.
Example:
Consider the QDP file:
1 2
2 1
NO NO
3 4
4 3
NO NO
NO NO
5 6
6 5
With the default SKip Off, the above will be plotted as two groups
each containing nine points. Using SKip Single, would cause the above
data to be divided into three groups. The first group would consist
of the data in the first three lines, the second would come from lines
four to seven, and the third group from lines eight and nine. Using
Skip Double would cause the above data to be plotted as two groups
with lines one through seven being in the first group and the last
two lines making the second group.
   
Next: STatistics
Up: PLT Command Summary
Previous: SHow
Web Page Maintained by: Dr. Lawrence E. Brown elwin@redshift.gsfc.nasa.gov
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