TABLE_CALC

       Adds a new table column from a expression using existing columns

       table_calc, table, expression, table_out

       table - input SDAS table table
       expression - expression for new or updated column values.
               Any legal IDL expression is valid where existing
               column names can be used as variables.  User functions
               within the expression are allowed if the function
               is in an IDL library or previously compiled.

       table_out - output table name.  If not supplied, the
               input name is used.

       a new SDAS table file is created.

        create a column WAVELENGTH in table TAB which is the average
       of the WLOW and WHIGH columns of table TAB.
               table_calc,'tab','WAVELENGTH=(WLOW+WHIGH)/2.0'
       add a column SINX which is the sin of column X to table JUNK.
               table_calc,'junk','SINX=sin(X)'
       add 10.0 to an existing column in table MYTAB.
               table_calc,'mytab','flux=flux+10.0'

       version 1  D. Lindler November, 1989
       Converted to IDL V5.0   W. Landsman   September 1997

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