xopt (PLCHAR_VECTOR(3plplot), input)
An ascii character string specifying options for the x axis. The string can include any
combination of the following letters (upper or lower case) in any order: a: Draws axis, X-axis is
horizontal line (y=0), and Y-axis is vertical line (x=0). b: Draws bottom (X) or left (Y) edge of
frame. c: Draws top (X) or right (Y) edge of frame. d: Plot labels as date / time. Values are
assumed to be seconds since the epoch (as used by gmtime). f: Always use fixed point numeric
labels. g: Draws a grid at the major tick interval. h: Draws a grid at the minor tick interval.
i: Inverts tick marks, so they are drawn outwards, rather than inwards. l: Labels axis
logarithmically. This only affects the labels, not the data, and so it is necessary to compute
the logarithms of data points before passing them to any of the drawing routines. m: Writes
numeric labels at major tick intervals in the unconventional location (above box for X, right of
box for Y). n: Writes numeric labels at major tick intervals in the conventional location (below
box for X, left of box for Y). o: Use custom labelling function to generate axis label text. The
custom labelling function can be defined with the plslabelfunc(3plplot) command. s: Enables
subticks between major ticks, only valid if t is also specified. t: Draws major ticks. u:
Exactly like "b" except don't draw edge line. w: Exactly like "c" except don't draw edge line.
x: Exactly like "t" (including the side effect of the numerical labels for the major ticks) except
exclude drawing the major and minor tick marks.
xtick (PLFLT(3plplot), input)
World coordinate interval between major ticks on the x axis. If it is set to zero, PLplot
automatically generates a suitable tick interval.
nxsub (PLINT(3plplot), input)
Number of subintervals between major x axis ticks for minor ticks. If it is set to zero, PLplot
automatically generates a suitable minor tick interval.
yopt (PLCHAR_VECTOR(3plplot), input)
An ascii character string specifying options for the y axis. The string can include any
combination of the letters defined above for xopt, and in addition may contain: v: Write numeric
labels for the y axis parallel to the base of the graph, rather than parallel to the axis.
ytick (PLFLT(3plplot), input)
World coordinate interval between major ticks on the y axis. If it is set to zero, PLplot
automatically generates a suitable tick interval.
nysub (PLINT(3plplot), input)
Number of subintervals between major y axis ticks for minor ticks. If it is set to zero, PLplot
automatically generates a suitable minor tick interval.