[ferret_users] to combine daily file to monthly

[jaya kumar A <jayamet@xxxxxxxxx>]

dear users,
2008011.nc,2008012.nc
i want to combine daily file like 
2008011.nc,2008012.nc,2008011.nc,2008013.nc...............................20080131.nc files

i want to combine this file to make monthly file , i tried like this 

set memory/size=300
define axis/T="1-jan-2008":"31-jan-2008":1/units=days TIME
LET tstamp = T[GT=TIME] * 0
repeat/l=1:31 (define symbol fname =  200801`l`.nc ; set data
($fname) ; Let SST1=SST +tstamp ; save/file=sst_0801.nc/CLOBBER/append
SST1; cancel data ($fname)  ; cancel memory )
cancel data/all

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! but i am getting like this |||||||||||||||||||||||||||||


repeat/l=1:31 (define symbol fname =  200801`l`.nc ; set data
($fname) ; Let SST1=SST +tstamp ; save/file=sst_0801.nc/CLOBBER/append
SST1; cancel data ($fname)  ; cancel memory )
 !-> repeat/l=1:31 (define symbol fname =  200801`l`.nc ;
set data ($fname) ; Let SST1=SST +tstamp ;
save/file=sst_0801.nc/CLOBBER/append SST1; cancel data ($fname)  ;
cancel memory )
!-> REPEAT: L=1
 !-> define symbol fname =  2008011.nc
 !-> set data 2008011.nc
 *** NOTE: Ambiguous coordinates on T axis: SST +TSTAMP
 LISTing to file sst_0801.nc
 !-> cancel data 2008011.nc*** NOTE: Ambiguous coordinates on T axis: SST +TSTAMP
  LISTing to file sst_0801.nc
 !-> cancel data 2008011.nc
 TEMPORARY data cleared from memory
!-> REPEAT: L=2
 !-> define symbol fname =  2008012.nc
 !-> set data 2008012.nc
 *** NOTE: Ambiguous coordinates on T axis: SST +TSTAMP
 **ERROR: illegal limits: "SST1" is not in the range L=2
          Axis extremes are L=1
LIST/FORMAT=CDF/file=sst_0801.nc/CLOBBER/append SST1
Command file, command group, or REPEAT execution aborted
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
my netcdf description of one file are given

dimensions:
        time = 1 ;
        zlev = 1 ;
        lat = 720 ;
        lon = 1440 ;
variables:
        float time(time) ;
               
time:long_name = "Center time of the day" ;
               
time:units = "days since 1978-01-01 00:00:00" ;
        float zlev(zlev) ;
               
zlev:long_name = "Sea surface height" ;
                zlev:units = "meters" ;
                zlev:actual_range = "0, 0" ;
        float lat(lat) ;
                lat:long_name = "Latitude" ;
                lat:units = "degrees_north" ;
               
lat:grids = "Uniform grid from -89.875 to 89.875 by 0.25" ;
        float lon(lon) ;
                lon:long_name = "Longitude" ;
                lon:units = "degrees_east" ;
               
lon:grids = "Uniform grid from 0.125 to 359.875 by 0.25" ;
        short sst(time, zlev, lat, lon) ;
               
sst:long_name = "Daily sea surface temperature" ;
                sst:units = "degrees C" ;
                sst:_FillValue = -999s ;
                sst:add_offset = 0.f ;
                sst:scale_factor = 0.01f ;
                sst:valid_min = -300s ;
                sst:valid_max = 4500s ;

// global attributes:
               
:title = "Daily optimum interpolation(OI) SST: AVHRR only;" ;
                :History = "Version 1.0" ;
               
:Description = "Reynolds, et al.(2006) Daily High-resolution Blended
Analyses. Available at
ftp://eclipse.ncdc.noaa.gov/pub/OI-daily/daily-sst.pdf 
Climatology is based on 1971-2000 OI.v2 SST, Satellite data: Navy
NOAA17 NOAA18 AVHRR, Ice data: NCEP ice" ;
               
:Source = "NOAA/National Climatic Data Center" ;
               
:Contact = "Dick Reynolds, email: Richard.W.Reynolds@xxxxxxxx &
Chunying Liu, email: Chunying.liu@xxxxxxxx" ;
                :netcdf_Convention = "COARDS" ;
data:

 time = 10958 ;

 zlev = 0 ;

thankful for all helps

- 
JAYAKUMAR A
Junior Research Fellow, 
Theoretical Studies Division
IITM, Pune-8