Re: Tic intervals and hlimits

[Mick Spillane <spillane@xxxxxxxxxxxxx>]

Hi Dan,
	The difference between the plotting of the sine function and the
navy winds plot is that the latter has by default a calendar axis in the
horizontal direction.  Plotplus has a series of commands to control this
axis to customize beyond the defaults that are provided.  If you really
want to use the hlimits values in your example you must first turn off the
calendar axis
	use monthly_navy_winds
	can mode calendar
	plot/hlimits=17598.000:113293.5:10000 uwnd[i=10,j=10]
	plot/hlimits=20000:100000:20000 uwnd[i=10,j=10]
when the horizontal axis is obedient to your hlimits wishes but since
(in this dataset) everything is done in hours, you lose the timeaxis
smarts that draws years, months, days or whatever is appropriate to
the time span of your time span.
	What I suspect would suit you best is to keep mode calendar on
but customize the time axis labelling.  For this you can consult the
Plotplus manual
	ftp://ftp.epic.noaa.gov/epic/manual-dir/pplus.pdf
and look at commands like TIME, TXLINT, TICS, and TXTYPE in Chapter 12.

EXAMPLE
If for example you wanted to plot only the years 1983-1990, dropping
the month labels (and tics) entirely and labelling only every 3rd year you
could try
	use monthly_navy_winds
	set mode calendar  ! only if you had turned it off before
	region/i=10,j=10/l=13:108 ! l-values found by "show grid/t uwnd"
        plot/set uwnd
	ppl txlint,0,3     ! no month label, every 3rd year label
	ppl tics,0         ! turn off month tic marks (small x tics)
	ppl plot

Good luck,
Mick

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