Variable reassignment problem NCL 6.1.0

Hello

I am getting syntax error in the following simple NCL code:

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"

begin
a=addfile("../wrfchemi_00z_d01_seac4rs.nc","r")
b=addfile("../wrfinput_d01.nc","r")

sum=0.0
do i=0,98,1
 do j=0,108,1
  if (b->XLAND(0,j,i).ne.2)
   sum = sum + (a->E_CO(0,0,j,i))
  end if
 end do
end do
printVarSummary(a->E_CO)
printMinMax(a->E_CO, True)
print (sum)
avg=sum/10791.0
print(avg)
end

The above code is showing the following error:

fatal:syntax error: line 9 in file minmax.ncl before or near =
sum=
---^

fatal:error in statement
fatal:syntax error: line 13 in file minmax.ncl before or near =
   sum =
-------^

fatal:error in statement
fatal:syntax error: function sum expects 1 arguments, got 0
fatal:error at line 19 in file minmax.ncl

fatal:syntax error: procedure print expects 1 arguments, got 0
fatal:error at line 19 in file minmax.ncl

fatal:syntax error: line 20 in file minmax.ncl before or near =
avg=
---^

fatal:error in statement
fatal:syntax error: function avg expects 1 arguments, got 0
fatal:error at line 21 in file minmax.ncl

fatal:syntax error: procedure print expects 1 arguments, got 0
fatal:error at line 21 in file minmax.ncl

fatal:Syntax Error in block, block not executed
fatal:error at line 22 in file minmax.ncl

Please help me with this.

-- 
Thanks & Regards
Tabish Umar Ansari
MS Research Scholar
Environmental & Water Resources Engineering Division
Department of Civil Engineering
IIT Madras

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Received on Sat Mar 8 07:53:54 2014