function vortex (args)

EXPORT   = subwrd(args,1)
GC       = subwrd(args,2)

expid    = subwrd(args,3)
output   = subwrd(args,4)
debug    = subwrd(args,5)


* Initialize
* ----------
'reinit'
'set display color white'
'rgbset'
'set csmooth on'
'set clab off'
'c'

'run setenv "DO_STD" TRUE'

* Determine Variable Name and Location
* ------------------------------------
'run getvar 'EXPORT' 'GC
         mname  = subwrd(result,1)
         mfile  = subwrd(result,2)
         scale  = subwrd(result,3)
         expdsc = subwrd(result,4)

if( mfile = "NULL" ) ; return ; endif

'run getenv "GEOSUTIL"'
         geosutil = result
                                                                                                   
'run getenv "VERIFICATION"'
         verification = result

'run getenv "ANALYSIS"'
         analysis = result


* Model Experiment Data
* ---------------------
'set dfile 'mfile
'setdates'
'run getenv "BEGDATE"'
             begdate  = result
'run getenv "ENDDATE"'
             enddate  = result

'setlons'
'sety'
'setz'

'set t 1'
'getinfo month'
         begmonth = getmon(result)
'getinfo year'
         begyear  = result
'sett'


* Get Dimension of Model Environment
* ----------------------------------
'getinfo lonmin'
         lonmin = result
'getinfo lonmax'
         lonmax = result
'getinfo latmin'
         latmin = result
'getinfo latmax'
         latmax = result

                     ' alias ' mname
                      malias = result
'chckname            'malias
'makezf 'malias' umod z'
'set x 1'
'set y 1'
'define   umodzg = ave( umodz,lat=-70,lat=-50 )'
'seasonal umodzg '
 
*********************************************************************

  '!remove sedfile'
  '!touch  sedfile' 
  '!remove umodzg.ctl'
  '!remove umodzg.data'
   'set gxout fwrite'
   'set       fwrite umodzg.data'

   'getdates'
   'getinfo   tmin'
              tmin = result
              tmax = tmin + 11
         t  = tmin
while  ( t <= tmax )
   'set  t   't
   'getinfo  month'
             month = result
   'd umodzgclim'
   'd umodzgclim + umodzg'month'std'
   'd umodzgclim - umodzg'month'std'
         t  = t + 1
endwhile
   'disable fwrite'

'getinfo undef'
         undef = result
'getinfo zmin'
         zmin = result
'getinfo zmax'
         zmax = result
'set z  'zmin' 'zmax
         zdim = zmax-zmin+1
         levs = ''
            z  = zmin
         while( z <= zmax )
           'set z 'z
           'getinfo level'
            levs = levs' 'result
            z = z + 1
         endwhile

'!echo "s?qz.data?umodzg.data?g" >> sedfile'
'!echo "s?UNDEF?"'undef'?g >> sedfile'
'!echo "s?ZDIM?"'zdim'?g >> sedfile'
'!echo "s?BDATE?"'begdate'?g >> sedfile'
'!echo "s?LEVS?"'levs'?g  >> sedfile'
'!/bin/cp 'geosutil'/plots/grads_util/vortex.tmpl .'
'!sed -f   sedfile vortex.tmpl > umodzg.ctl'

'open umodzg.ctl'
'getinfo    numfiles'
            modfile = result
'set dfile 'modfile
'setx'
'sety'
'setz'
'sett'
'define modclim  = uz'
'define modclimp = uzp'
'define modclimm = uzm'
'modify modclim  seasonal'
'modify modclimp seasonal'
'modify modclimm seasonal'
'close 'modfile
'set dfile 'mfile
'setlons'
'sety'
'setz'

*********************************************************************
****   Loop over Possible Experimental Datasets for Comparison   ****
*********************************************************************

facm = 1
faco = 1

'!/bin/mv HISTORY.T HISTORY.Tmp'
'run getenv "CMPEXP"'
         cmpexp = result
            num = 1
            exp = subwrd( cmpexp,num )
while( exp != 'NULL' )
say ' '
say 'Comparing with: 'exp

'run setenv "LEVTYPE" 'A

'!chckfile 'exp'/.HOMDIR'
 'run getenv CHECKFILE'
         CHECKFILE  = result
     if( CHECKFILE != 'NULL' )
        '!/bin/cp `cat 'exp'/.HOMDIR`/HISTORY.rc .'
     else
        '!/bin/cp 'exp'/HISTORY.rc .'
     endif
'!remove CHECKFILE.txt'

'!cat HISTORY.rc | sed -e "s/,/ , /g" | sed -e "s/*/@/g" > HISTORY.T'

    'run getvar 'EXPORT' 'GC' 'exp
               oname = subwrd(result,1)
               ofile = subwrd(result,2)
              oscale = subwrd(result,3)
              obsdsc = subwrd(result,4)
              obsnam = subwrd(result,5)

if( analysis != "false" )
   'run setenv "LEVTYPE" 'A
else
   'run setenv "LEVTYPE" 'D
endif

* Compute PLOT for Specific Verification
* --------------------------------------
if( oname != 'NULL' ) 

'set dfile 'ofile
    'getdates'
     begdateo = subwrd(result,1)
     enddateo = subwrd(result,2)

'set lon 'lonmin' 'lonmax
'set lat 'latmin' 'latmax
'setz'

                     ' alias ' oname
                      oalias = result
'chckname            'oalias
'makezf 'oalias' uobs z'
'set x 1'
'set y 1'
'define   uobszg = ave( uobsz,lat=-70,lat=-50 )'
'seasonal uobszg'
 
*********************************************************************

  '!remove sedfile'
  '!touch  sedfile' 
  '!remove uobszg.ctl'
  '!remove uobszg.data'
   'set gxout fwrite'
   'set       fwrite uobszg.data'

   'getdates'
   'getinfo   tmin'
              tmin = result
              tmax = tmin + 11
         t  = tmin
while  ( t <= tmax )
   'set  t   't
   'getinfo  month'
             month = result
   'd uobszgclim'
   'd uobszgclim + uobszg'month'std'
   'd uobszgclim - uobszg'month'std'
         t  = t + 1
endwhile
   'disable fwrite'

'getinfo undef'
         undef = result
'getinfo zmin'
         zmin = result
'getinfo zmax'
         zmax = result
'set z  'zmin' 'zmax
         zdim = zmax-zmin+1
         levs = ''
            z  = zmin
         while( z <= zmax )
           'set z 'z
           'getinfo level'
            levs = levs' 'result
            z = z + 1
         endwhile

'!echo "s?qz.data?uobszg.data?g" >> sedfile'
'!echo "s?UNDEF?"'undef'?g >> sedfile'
'!echo "s?ZDIM?"'zdim'?g >> sedfile'
'!echo "s?BDATE?"'begdateo'?g >> sedfile'
'!echo "s?LEVS?"'levs'?g  >> sedfile'
'!/bin/cp 'geosutil'/plots/grads_util/vortex.tmpl .'
'!sed -f   sedfile vortex.tmpl > uobszg.ctl'

'open uobszg.ctl'
'getinfo    numfiles'
            obsfile = result
'set dfile 'obsfile
'setx'
'sety'
'setz'
'sett'
'define obsclim  = uz'
'define obsclimp = uzp'
'define obsclimm = uzm'
'modify obsclim  seasonal'
'modify obsclimp seasonal'
'modify obsclimm seasonal'
'close 'obsfile 
'set dfile 'ofile
'setlons'
'sety'
'setz'

*********************************************************************

'run getenv "BEGDATEO"'
         begdateo = result
'run getenv "ENDDATEO"'
         enddateo = result

if( begdate = "NULL" )
   'set dfile 'mfile
   'set t    '1
   'getinfo date'
         begdate = result
endif
if( enddate = "NULL" )
   'set dfile 'mfile
   'getinfo tdim'
            tdim = result
   'set t  'tdim
   'getinfo date'
         enddate = result
endif

'run getenv "CLIMATE"'
         climate = result
if( begdate = begdateo & enddate = enddateo )
         climate = 'Actual'
endif

* Make PLT
* --------
                       flag = ""
               while ( flag = "" )

'set dfile 'mfile
'count "SON" 'begdate' 'enddate
 nmod1 =  result
'count "DJF" 'begdate' 'enddate
 nmod2 =  result
 nmod  = (nmod1+nmod2)/2

'set dfile 'ofile
'count "SON"'
 nobs1 =  result
'count "DJF"'
 nobs2 =  result
 nobs  = (nobs1+nobs2)/2

 nextyear = begyear + 1
'set time SEP'begyear' APR'nextyear

'set x 1'
'set y 1'
'run 'geosutil'/plots/zcmp1/vortex.plt 'nmod' 'nobs' 'expdsc' 'obsdsc' 'obsnam' 'output' 'climate

                if( debug = "debug" )
                    say "Hit  ENTER  to repeat plot"
                    say "Type 'next' for  next plot, 'done' for next field"
                    pull flag
                else
                    flag = "next"
                endif
               endwhile
              'c'

* End check for valid OBS
* -----------------------
endif

* Check next Comparison Experiment Dataset
* ----------------------------------------
  num = num + 1
  exp = subwrd( cmpexp,num )
endwhile
'!/bin/mv HISTORY.Tmp HISTORY.T'

*********************************************************************
****   Loop over Possible Verification Datasets for Comparison   ****
*********************************************************************

facm = 1
faco = 1

* Get Plotting Values from Resource File
* --------------------------------------
'run getenv "GEOSUTIL"'
         geosutil = result
PLOTRC = geosutil'/plots/grads_util/plot.rc'

' getnumrc 'geosutil'/plots/zcmp1'
     rcinfo = result
     numrc  = subwrd( rcinfo,1 )
       num  = 1
       cnt  = 0
while( num <= numrc )
        loc = num + 1
     rcfile = subwrd( rcinfo,loc )
              OBS = EXPORT
     'run getobs 'OBS' 'GC' 'rcfile
               oname = subwrd(result,1)
               ofile = subwrd(result,2)
              oscale = subwrd(result,3)
              obsdsc = subwrd(result,4)
              obsnam = subwrd(result,5)

if( analysis != "false" )
   'run setenv "LEVTYPE" 'A
else
   'run setenv "LEVTYPE" 'D
endif

* Compute PLOT for Specific Verification
* --------------------------------------
if( oname != 'NULL' ) 

'set dfile 'ofile
    'getdates'
     begdateo = subwrd(result,1)
     enddateo = subwrd(result,2)

'set lon 'lonmin' 'lonmax
'set lat 'latmin' 'latmax
'setz'

                     ' alias ' oname
                      oalias = result
'chckname            'oalias
'makezf 'oalias' uobs z'
'set x 1'
'set y 1'
'define   uobszg = ave( uobsz,lat=-70,lat=-50 )'
'seasonal uobszg'
 
*********************************************************************

  '!remove sedfile'
  '!touch  sedfile' 
  '!remove uobszg.ctl'
  '!remove uobszg.data'
   'set gxout fwrite'
   'set       fwrite uobszg.data'

   'getdates'
   'getinfo   tmin'
              tmin = result
              tmax = tmin + 11
         t  = tmin
while  ( t <= tmax )
   'set  t   't
   'getinfo  month'
             month = result
   'd uobszgclim'
   'd uobszgclim + uobszg'month'std'
   'd uobszgclim - uobszg'month'std'
         t  = t + 1
endwhile
   'disable fwrite'

'getinfo undef'
         undef = result
'getinfo zmin'
         zmin = result
'getinfo zmax'
         zmax = result
'set z  'zmin' 'zmax
         zdim = zmax-zmin+1
         levs = ''
            z  = zmin
         while( z <= zmax )
           'set z 'z
           'getinfo level'
            levs = levs' 'result
            z = z + 1
         endwhile

'!echo "s?qz.data?uobszg.data?g" >> sedfile'
'!echo "s?UNDEF?"'undef'?g >> sedfile'
'!echo "s?ZDIM?"'zdim'?g >> sedfile'
'!echo "s?BDATE?"'begdateo'?g >> sedfile'
'!echo "s?LEVS?"'levs'?g  >> sedfile'
'!/bin/cp 'geosutil'/plots/grads_util/vortex.tmpl .'
'!sed -f   sedfile vortex.tmpl > uobszg.ctl'

'open uobszg.ctl'
'getinfo    numfiles'
            obsfile = result
'set dfile 'obsfile
'setx'
'sety'
'setz'
'sett'
'define obsclim  = uz'
'define obsclimp = uzp'
'define obsclimm = uzm'
'modify obsclim  seasonal'
'modify obsclimp seasonal'
'modify obsclimm seasonal'
'close 'obsfile 
'set dfile 'ofile
'setlons'
'sety'
'setz'

*********************************************************************

'run getenv "BEGDATEO"'
         begdateo = result
'run getenv "ENDDATEO"'
         enddateo = result

if( begdate = "NULL" )
   'set dfile 'mfile
   'set t    '1
   'getinfo date'
         begdate = result
endif
if( enddate = "NULL" )
   'set dfile 'mfile
   'getinfo tdim'
            tdim = result
   'set t  'tdim
   'getinfo date'
         enddate = result
endif

'run getenv "CLIMATE"'
         climate = result
if( begdate = begdateo & enddate = enddateo )
         climate = 'Actual'
endif

* Make PLT
* --------
                       flag = ""
               while ( flag = "" )

'set dfile 'mfile
'count "SON" 'begdate' 'enddate
 nmod1 =  result
'count "DJF" 'begdate' 'enddate
 nmod2 =  result
 nmod  = (nmod1+nmod2)/2

'set dfile 'ofile
'count "SON"'
 nobs1 =  result
'count "DJF"'
 nobs2 =  result
 nobs  = (nobs1+nobs2)/2

 nextyear = begyear + 1
'set time SEP'begyear' APR'nextyear

'set x 1'
'set y 1'
'run 'geosutil'/plots/zcmp1/vortex.plt 'nmod' 'nobs' 'expdsc' 'obsdsc' 'obsnam' 'output' 'climate

                if( debug = "debug" )
                    say "Hit  ENTER  to repeat plot"
                    say "Type 'next' for  next plot, 'done' for next field"
                    pull flag
                else
                    flag = "next"
                endif
               endwhile
              'c'

* End check for valid OBS
* -----------------------
endif

* Check next Verification Dataset
* -------------------------------
num = num + 1
endwhile

'run setenv "DO_STD" FALSE'
return

function getdate (date,month,year)
       num = 1
       bit = substr(date,num,1)
while( bit != '' )
       num = num+1
       bit = substr(date,num,1)
endwhile
       loc = num-7
     month = substr(date,loc  ,3)
      year = substr(date,loc+3,4)
return month' 'year

function getmon(month)
            if( month = JAN ) ; num = "01"  ; endif
            if( month = FEB ) ; num = "02"  ; endif
            if( month = MAR ) ; num = "03"  ; endif
            if( month = APR ) ; num = "04"  ; endif
            if( month = MAY ) ; num = "05"  ; endif
            if( month = JUN ) ; num = "06"  ; endif
            if( month = JUL ) ; num = "07"  ; endif
            if( month = AUG ) ; num = "08"  ; endif
            if( month = SEP ) ; num = "09"  ; endif
            if( month = OCT ) ; num = "10"  ; endif
            if( month = NOV ) ; num = "11"  ; endif
            if( month = DEC ) ; num = "12"  ; endif
return num