log plots for a depth axis

[Brent A McDaniel <gte328r@xxxxxxxxxxxxxxxxxxxxx>]

Hi Ferreters,

I'm trying to make plots for atmospheric data where the vertical
coordinate is pressure.  The vertical axis is from 1000mb up to 10mb.  The
levels are not equally spaced.  What I want is a plot with pressure on the
y-axis, but plotted logarithmically.  Hopefully you understand what I mean
as this is the a pretty way to do these types of plots.
I'll try my hand at crude ascii art.



10
.
.
.
.

100 |
    |
    |
    |
200 | <-- y-axis is spaced log
    |
    |
300 |
    |
    |
500 |
    |
700 |
    |
850 |
1000|
    ---------------------------------------------
			x-axis is normal

After reading the FAQ and the mailing list archives, I started by defining
a new z-axis:
yes? define axis/from/name=test/z log(z[gz=level])
and plotting things by:
yes? contour temp[gz=test@asn]

This produces a log plot but the y-axis is inverted (which makes sense as
the logs of the highest pressure levels will be the smallest.  Also, the
y-axis doesn't have the original pressure levels on it but the new values
(1-3 from log10 to log1000).  The inversion was fixed by adding the /depth
qualifier to the define axis statement. (now I'm using:
define axis/from/name=test/z/depth log(z[gz=level]) but I still have the
problem of the y-labels not being the original 1000-10 values.


Does anyone have a decent workaround for this? I've got a meeting next
week and plots that need to be done. *yikes!*

Thanks as always.

- Brent


-- 
Brent A. McDaniel

Dept of Earth and Atmospheric Sciences
Georgia Institute of Technology
Atlanta, Ga.  USA