log-depth-axis contour plot

[Patrick Joeckel <joeckel@xxxxxxxxxxxxxxxxx>]

Dear Ferret Users,

On Fri, 19 Feb 1999 13:38:47 +0100 (MET) 
Rodrigo Caballero Augi gave the following example to do log-log contour 
plots and achieve a proper log-axis, i.e.
'the contours rescaled to the log axes *and* the "ppl axtype 2,2"-style 
tic marks - that is, with the ticks unevenly spaced'.

However, if I try this with a /DEPTH-defined axis,
ferret exits with this messages :
YLO,YHI                                   on DEC-Alpha (Version 5) 

STOP: YLO,YHI                         
Warning: Floating underflow occurred      on a Linux-PC (Version 5)

Does anybody have a solution ?

Thank you for your help !

Sincerely,

               Patrick Joeckel


here is the above cited suggestion for non /DEPTH-defined axes:
!!!!!!
 ! suppose you have some data on a grid x=1:100:1, y=1:100:1
 define axis/x=1:100:1 xax
 define axis/y=1:100:1 yax
 define grid/x=xax/y=yax gg
 set grid gg
 let a = LOG(x/10)+y/100    ! some made up data
 
 ! plot untransformed data in the upper plot
 set view upper
 ppl axtype 1,1
 contour a
 
 ! define a new axis with the LOG transform of the X coordinates
 define axis/from/name=xlog/x LOG(x)
 
 ! plot LOG-transformed data in the lower plot
 set view lower
 ppl axtype 2,1
 contour a[gx=xlog@asn]*0
 ppl axtype 1,1
 contour/over/pen=1/nolab a[gx=xlog@asn]
!!!! end of example

---------------------------------------------------------------
Patrick Joeckel
Max Planck Institute for Chemistry
Joh.-J. Becher Weg 27         
55128 Mainz                   phone:++49-6131-305452      
Germany                       fax  :++49-6131-305436     
                             e-mail:joeckel@mpch-mainz.mpg.de
                         http://www.mpch-mainz.mpg.de/~joeckel
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