3.2.16. - Options +Dskip, =Dtotal, &, . and @
The
+skip and
=total options let you select
particular windows of data from your file.
They also can be used to
read in sections of a file for editing under mode 7.
Skip
is
an integer telling the program how many lines in a file to skip before
starting to read in data points.
When skipping lines, each line in
the file is counted, whether it contains valid data or not.
Total
specifies the maximum number of points to be read from the file.
The
& argument causes the data points being obtained to be appended
to the current data points.
The
@ argument specifies real-time plotting.
When you plot the
points, C-PLOT will first draw any data already
in a file.
It will then continue to check the file to see if more
points have been added, plotting them as they appear.
If the end-of-file
character ( ASCII
\004) or a
^D are read from the file
after a newline, the program stops reading the file and proceeds to
the next command (if running from a command file) or to the
PLOT-> prompt (if running interactively.)
You also can use a
^C to
interrupt the reading.
In the present implementation, the program
sleeps for one second between checks for new data.
The optional arguments
+skip , =total , & and
@ are typed after the file name and separated from the file
name by space.
Entering
gd .
tells C-PLOT to get data
using the same mode and file name as before.
For the modes with specified
columns (3, 5, 8 and 12), you will still be prompted for column numbers.
You can use
. to keep the same file name when switching
to a different mode.
After entering
gd 2 filename,
for example,
you can enter
gd 3 .
to indicate you want to use the same
file, but this time you want to specify the columns.
You can use the
+skip , =total , & and
@ options with the
. option.
For instance,
gd . +1024
will begin reading at the 1025th line in the current data file.
If
you followed that with just
gd .,
the first points in the file
will be read.
The
. option does not repeat modes 6, 7, 10 or 15.