Project : HESSI Name : IS_STRING Purpose : return true is input is a non-blank string Category : string utility Syntax : IDL> a=is_string(input) Inputs : INPUT_STR = input variable to check Outputs : 0/1 if blank/nonblank Keywords : return true (1), even if string is blank Opt. Outputs: NONBLANK = noblank copies of input (if input is array, then nonblanks are filtered out) History : 17-Nov-1999, Zarro (SM&A/GSFC) 5-Feb-2003, Zarro (EER/GSFC) - added /BLANK Contact : dzarro@solar.stanford.edu