Re: z-axis in centimeters

[Mick.Spillane@xxxxxxxx]

> I'm using model outputs with depth in centimeters (cm), and would
> like to know the easiest way to make plots in kilometers. Is it
> necessary to create a new grid?
>
Hi Domingos,
	There are several ways to do this if it were a line plot you
were creating. But a more general way that would work (without regridding)
would be to initially create the plot without the axis (using ppl axset
to turn off the unwanted axes) then at the end add axes of your choice
using "ppl %xaxis" or "ppl %yaxis". See "13 Advanced Commands" in the
Plot Plus User's Guide
	ftp://ftp.pmel.noaa.gov/epic/manual-dir/pplus.pdf
for the syntax of the %xaxis command.

Good luck,
Mick
-----------------------------------------------------------------------
! Here is an example

! define a dummy variable ...
def axis/x=500000:1000000:100000/units=centimeters xax
def axis/y=20n:50n:1/units=latitude yax
def grid/x=xax/y=yax grd
let v=i[g=grd]+j[g=grd]
! ... and fill it
set view upper ; fill v

! now suppose we wanted the plot to show the x-axis in km
set view lower ; fill/set v
ppl axset,1,0,1,1 ! turn off the bottom axis
ppl xlab,@sr ; ppl fill ! turn off the default axis and draw the plot
ppl xlab,@srDistance (km)   ! make a more appropriate axis label
ppl %xaxis/nouser,,,,0,,,100000,-1,0.15,(i2) ! draw the desired axis

! Note that in this example the axis is unchanged except for a
! rescaling with the divisor 100000 (cm -> km). But the %xaxis
! command could be used to draw a completely arbitrary axis too.
! Suppose it were desirable to add another x-axis with units in
! nautical miles from some point A. Then we might blank out the
! top axis too and add another %xaxis there.

set view lower ; fill/set v
ppl axset,0,0,1,1 ! turn off both x-axes
ppl xlab,@sr ; ppl fill
ppl xlab,@srDistance (km)   ! make a label for the lower axis
ppl %xaxis/nouser,,,,0,,,100000,-1,0.15,(i2) ! and draw it
ppl xlab,@srDistance East of A (nautical miles)
! 5km = 2.7nm using 40,000km = 360*60nm
ppl %xaxis/nouser,0,2.7,0.5,`($ppl$ylen)`,,1,,1,0.15,(f3.1)

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