The Size function doesn't seem to be working like I think it should.  Here are some command line things I've tried.   According to the help file when the first element of the vector is zero, the argument of Size is a scalar or undefined.  In the cases below and in my program's call to this function, the argument is a string.  This is important because it bombs my program.  Previously, calls to this function worked.  I don't know what happened Here is what the help file says: "The first element is equal to the number of dimensions of Expression. This value is zero if Expression is scalar or undefined. The next elements contain the size of each dimension, one element per dimension (none if Expression is scalar or undefined). After the dimension sizes, the last two elements contain the type code (zero if undefined) and the number of elements in Expression, respectively. The type codes are listed below." Here are some examples of what I've tried: IDL> print, size('/Volumes/Apps_and_Docs/data_observing_processed/EPOXI/epoxi_analysis_output/header_tests/hrivis_canopus_080624_1_0_1.fit')            0           7           1 IDL> junk = 'crapola' IDL> print, size('junk')            0           7           1 IDL> print, size(junk)            0           7           1   These examples don't seem to work like the help file says they should... unless I don't understand.   Thanks in advance.   Rich