3.2.2. - File format; specifying columns
Get data
modes 2, 3, 4, 5, 11 and 12 take data from
ASCII
files.
Modes 1 and 8, which read from the keyboard, obey similar rules.
C-PLOT interprets columns as sequences of characters
(not necessarily numbers) separated by any number of space or tab
characters.
For
get-data
modes 1, 2, 4 and 11, the default
column ordering puts
x
and
y
values in the first two
columns.
For 2D plotting the next columns are assigned to
x
error bars (represented as
r),
y
error bars (represented
as
s)
and pen control (represented by
p),
but these
columns will be scanned for values only if the respective features
have been turned on using the
error-bar
or
line-control
commands.
(See
eb below and
lc in Chapter 5.)
In 3D mode,
the first three columns are for
x,
y
and
z
data.
Optional columns for
z
error bars (also represented as
s)
and pen-control information follow.
Under
get-data
modes 3, 5, 8 and 12, you specify the columns
from which C-PLOT will take data values.
If
you enter a value of 0 for the
x,
y
or
z
column, the
current value for each point will be retained.
If you enter a negative
value for the columns for
x,
y,
z
or all three, the
index number of the point (starting at 0) will be assigned rather
than a number from the file.
There may be up to 2,048 characters on
an input line; any additional characters are discarded.
There is no
limit on the number of columns as long as the data is within the first
2,048 characters of the input line.
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