Operating a mathematical function to a GPhys variable.
% gpmath [options] path@varname[,dimname=pos1[:pos2[:thinning_intv]][,dimname=...]]
-h, --help : print this message. -f func, --function func : function name to operate (optional). : Default function name is $0[2..-1]. -n name, --name name : name of the output gphys variable (optional). -l name, --longname name : long_name attr. of the output gphys variable (optional). -o file, --output file : output filename (optional). : Default output filename is 'gphys.nc'.
2005/06/21 S Takehiro (created) 2005/07/15 S Takehiro (open_gturl method is used for opening gphys variable) 2005/08/10 S Takehiro (utilize internal function for printing help message) 2005/08/21 S Takehiro (global attributes copied to the output file) 2005/08/23 S Takehiro (common methods to gp* command moved to gpcommon.rb)