Re: constant values

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi James,
That's interesting - I never knew Ferret did that.  The contour and fill 
commands
do interpolations to draw the lines or find the boundaries between 
different colors,
and that's meaningless of course with a constant field, so the code just 
skips out
before doing any plotting.  It would be nice if Ferret would put a note 
on the plot
page to indicate "Constant field, value xx"  or something.

A SHADE plot will show you one solid color, and a colorbar with the value
of the field labelled.

You can get the value of the field after issuing your FILL command by 
looking
at the Ferret symbols  PPL$ZMIN and PPL$ZMAX, so that'd be a way to add
your own label

 yes? use coads_climatology
 yes? let a = 4 + 0*sst
 yes? shade a[L=1]

 yes? fill aa[L=1]
 yes? show sym ppl$z*
 yes?  if `($ppl$zmin) eq ($ppl$zmax)` then \
     label/nouser 2, 1, 0, 0, 0.14, "constant value=($ppl$zmax)"

Ansley

James Booth wrote:

> I write a surface tracer flux to a netcdf file.  If the flux is a constant
> value (non-zero) the fill and cont plots show nothing.
>
>
> I was hoping that this is just a quirk in Ferret that could be
> fixed with some other descriptors when I call the fill command.
>
> Thanks
>
> *_*_*_*_*_*_*_*_*_*_*_*_*_*_*_*
> Jimmy Booth
> JISAO, 120B Lisa Li Bldg
> phone: 206-685-2585
>
>