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NAME lp_plot - simple plot on the
printer
SYNOPSIS lp_plot
[data_group] [x_element]
[y_element]
DESCRIPTION The lp_plot macro outputs
a simple plot of the current data on the associated printer.
The plot is formatted for a 132-column page width. If you
are using 8.5" paper, you must put the printer in compressed
mode. Use either the printer manual controls or one of the
macros initdw, initfx,
inithp, initnec or
initoki, that send the appropriate control sequences
to the printer to place it in compressed mode.
The macro does a form feed before plotting if the number of
data points is greater than 22. You should always adjust the
fan-fold paper in the printer so that after a form feed, the top
of the page is even with (or just above) the top of the ribbon.
Without arguments, data from the group given by
PL_G (or group PL_G1, if the
background-subtraction option is in effect) and the x and y
elements given by PL_X and PL_Y are
plotted. By default, these are set to group zero and elements
zero and one.
The optional arguments to lp_plot override the
global values of PL_G (or PL_G1),
PL_X and/or PL_Y. For example,
lp_plot 2 plots the data from group 2 using
PL_X for x and PL_Y for
y.
The setplot macro lets you select whether you
want automatic printer plots made after each scan. To disable
all output to the printer, select /dev/null as the printer
device, either by assignment,
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