The following comparison operations are supported:

    == (equal)        != (unequal)     < (less)
    <= (less equal)   > (greater)      >= (greater equal)
    

The arguments of a comparision operation can be:

    Function    <op> Function
    Function    <op> column type
    column type <op> Function
    Comparison <op> Function
    Comparison <op> column type
    

The last two operator groups are necessary to support constructs such as

    5 < Column ("Amplitude") < 10
      or
    Column ("Time(0)") == 
       Column ("Time(1)") ==
          Column ("Time(2)")
    

The last expression tests whether Time(0) and Time(1) are equal and whether Time(1) and Time(2) are equal as well.

Author:

Written June 2001 by Masahiro Ito and Daniel Sigg

Version:

1.0