[gradsusr] plotting over 0E from netCDF

[Cathy Smith (NOAA Affiliate)]

Hi all
This should be an easy question but I'm stumped. I'm trying to plot 
Africa (20W to 55E). the file I'm plotting from is netCDF and the 
longitudes are 0 to 359.27

e.g.
  lon = 0, 0.7031252, 1.40625, 2.109376, 2.812501, 3.515626, 4.218751,
     4.921877, 5.625002, 6.328127, 7.031252, 7.734378, 8.437503, 9.140628,
     9.843754, 10.54688, 11.25, 11.95313, 12.65625, 13.35938, 14.0625, 
......
     354.3751, 355.0782, 355.7814, 356.4845, 357.1876, 357.8907, 358.5939,
     359.297 ;

my grads code has

  if( proj = 'africa' )
     'set mproj latlon'
     'set mpdset mres'
     'set lat -40 45'
     'set lon -20 55'
     'set grid on'
     'set frame on'
     'set ylint 5'
      istate=0
   endif

which plots the data from 0 to 55 only and not the data between 340 and 360.

I also tried 340 to 415 instead of -20 to 55 and that plotted the data 
from 340 to 0 and not 0 to 55.

What am I doing wrong? I know this can be done in GrADS.

Thanks
Cathy

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