5.5. - ra, ro select axis range, select range options
C-PLOT sets the axis ranges and the positioning
and style of the tick marks when the first set of data is read.
It
will maintain these parameters until
np is executed, the ranges
are changed using
ra or
ro, or the
reset
command,
re, clears the current data.
Select axis range
lets you set minimum and maximum ranges for
each axis.
Select range options
lets you choose the style of
the axis tick marks in addition to setting the range.
ra
ra x|y|z
ra xmin [xmax [ymin [ymax [zmin [zmax]]]]]
ra y ymin [ymax]
ra z zmin [zmax]
ro
or
ro x|y|z
When
ra is entered, C-PLOT prompts for
minimum and maximum values for each axis.
The current minimum and
maximum are shown in parentheses.
Enter
<return> to maintain
the current values.
If you specify a single axis by entering
x, y or
z as an argument, you will only be asked to range that axis.
If you only range one axis and there is data present, you will be
asked if you want C-PLOT to reset the ranges
on the other axes.
If so, the program will reset the other axes so
they include only the range of points corresponding to the plot section
you chose for the first axis range.
If you specify one to six numerical arguments, they will be taken
as, in order, the minimum and maximum values for the
x-axis,
then the
y-axis,
then the
z-axis.
You also can give
the argument
y and specify one or two values for the
y-axis
range or the argument
z and specify one or two values for the
z-axis
range.
You won't be prompted for other information when
you give numerical arguments.
C-PLOT ordinarily automatically determines the
positioning and spacing of the tick marks and the numbering of
each axis.
You can control these parameters, however, either by using
the
ty command (see below) or by setting them with the
ro command.
Entered without an argument,
ro will prompt for the range minimums
and maximums for all axes.
If you specify
x, y or
z, you will be prompted only for that axis.
In addition,
ro will
prompt you to choose among three other options:
Exact Ranges . The axis will begin and end at the specified
minimum and maximum.
The tick spacing and numbering will be decided
according to C-PLOT's standard algorithm.
The
default is off.
Axis Padding . The first and last tick marks will be
moved in slightly from the end of the axis if the minimum or maximum
range value is too near to or coincides with the first and last tick
positions.
Axis padding cannot be used with the exact-ranges option.
The default is on.
User-Defined Tick Spacing . The first and last tick
marks and the corresponding axis numbers will coincide with the minimum
and maximum range values.
With linear axes, you specify how many intervals
are to be used and how many intermediate tick marks are to be placed
in each interval.
With logarithmic axes, you specify how many major
intervals between numbers and the number of intermediate tick marks.
The latter is rounded down to eight, two or zero.
The default is off.
The next example shows the effect of axis padding and exact ranges:
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