varid return value

[Gary Hodges]

The netcdf man page indicates that ncvarid will return a value of -1 if 
an error occurs.  I have the following code and I know that "head_temp2" 
does not exist in the netcdf file.

my $vid = NetCDF::varid($ncid, "head_temp2");
print("$vid\n);

I get the error "ncvarid: ncid 5: Variable not found" when this is run. 
  Ultimately what I want to do is test if a variable exists and set a 
flag based on the result so I'm not necessarily tied to varid.

Gary

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