Re: Variable (time) is undefined

Dear Zhifeng,   Thanks a lot. It helps!   Mark On Saturday, January 18, 2014 8:12 PM, zhifeng yang <yangzf01_at_gmail.com> wrote: Hi Mark time is only a variable dimension name in wrfot_ file, like attribute. You can not just it while you read the variable. If you want to read the whole variable, you can simply use T(:, :, :, :). If you want to use dimension name while reading the variable, you can use T(time|:, long|:, lat|:, level|:). If you just want to extract some dimension of variable, you can use T(0:2, :, :, :). Actually there is one variable in wrfout_ file, called “Times”, It has 2-Dimension. The first dimension is how many times you have in the wrfout_ file. The second dimension is the character length of “Times”, usually it has 19 characters. So that means Times’ dimension is like (:, 19). For your case, you need to read out how many time you have in the wrfout_ file. Then you can specify which time you want to read out. Thank you Zhifeng (Bruce) Yang Homepage : http://zyang01.com/ On Jan 18, 2014, at 12:30 PM, Mark Chan <cym263_at_yahoo.com> wrote: Dear NCL users, > > >Below is a ncl script, which runs some errors. > > > >--------ncl script-------------------------- > >  load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl" >  load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl" >  load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl" >  load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl" >  load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl" >  load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRF_contributed.ncl" > >  nc_file = systemfunc("ls -1 wrfout_d01_*") + ".nc" >  a = addfiles(nc_file,"r") >      T  = nc_file->T(time,:,:,:) >      th = T + 300. >       P  = nc_file->P(time,:,:,:) >       PB = nc_file->PB(time,:,:,:) >       p  = ( P + PB ) >       tk = wrf_tk( p , th ) >       QVAPOR = nc_file->QVAPOR(time,:,:,:) >       PH     = nc_file->PH(time,:,:,:) >       PHB    = nc_file->PHB(time,:,:,:) >       var    = ( PH + PHB ) / 9.81 >       dim    = dimsizes(var) >       z      = 0.5 * ( var(0:dim(0)-2,:,:) + var(1:dim(0)-1,:,:) ) >       slp   = wrf_slp( z, tk, p, QVAPOR ) > > > > >The error messages are as in the below. Can one give a suggestion? > > >Thanks a lot! >Mark > > > >============Error message============================================== > > Copyright (C) 1995-2013 - All Rights Reserved > University Corporation for Atmospheric Research > NCAR Command Language Version 6.1.2 > The use of this software is governed by a License Agreement. > See http://www.ncl.ucar.edu/ for more details. >fatal:Variable (time) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 12 in file slp3.ncl > >fatal:Variable (T) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 13 in file slp3.ncl > >fatal:Variable (time) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 15 in file slp3.ncl > >fatal:Variable (time) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 16 in file slp3.ncl > >fatal:Variable (P) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 17 in file slp3.ncl > >fatal:Variable (p) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 19 in file slp3.ncl > >fatal:Variable (time) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 21 in file slp3.ncl > >fatal:Variable (time) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 22 in file slp3.ncl > >fatal:Variable (time) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 23 in file slp3.ncl > >fatal:Variable (PH) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 24 in file slp3.ncl > >fatal:Variable (var) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 25 in file slp3.ncl > >fatal:Undefined identifier: (var) is undefined, can't continue >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 26 in file slp3.ncl > >fatal:Variable (z) is undefined >fatal:["Execute.c":8128]:Execute: Error occurred at or near line 28 in file slp3.ncl > >_______________________________________________ >ncl-talk mailing list >List instructions, subscriber options, unsubscribe: >http://mailman.ucar.edu/mailman/listinfo/ncl-talk >

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Received on Sat Jan 18 14:55:57 2014