Negative longitudes

["McCann, Mike" <mccann@xxxxxxxxx>]

Hi Ferreters,

I'm trying to rename an axis and have encountered a strange thing
that can be boiled down to this little example:

  def axis/x/units=deg/modulo x1={-122.5}		! Negative Long
  let v1=x[gx=x1]
  def axis/x/units=deg/modulo/name=x2 v1

gives the error:

  **ERROR: illegal limits: V1 is not in the range X=122.5W(-122.5)
          Axis extremes are X=122.5W(-122.5)

whereas

  def axis/x/units=deg/modulo x1={122.5}		! Positive Long
  let v1=x[gx=x1]
  def axis/x/units=deg/modulo/name=x2 v1

gives no error.

I've read 
http://ferret.wrc.noaa.gov/Ferret/Mail_Archives/fu_97/msg00031.html
but would prefer not having to add 360 to my longitudes.

Is the above example normal behavior?  Is there a simpler way to
give an axis a new name?

Thanks in advance,
Mike

--
Mike McCann   (mccann@mbari.org)
Monterey Bay Aquarium Research Institute
7700 Sandholdt Road
Moss Landing, CA 95039-9644
Voice: (831) 775-1769   Fax: (831) 775-1646 http://www.mbari.org/rd/iag.htm