A double negative

[Vic Norton]

I was going crazy last night trying to debug an octave routine. I 
finally found the problem. I had assumed that, if A is false, then ~A 
is must be true. My assumption turned out to be false in octave.

Example:

   A = [];

   if A
      printf ("A is true\n");
   else
      printf ("A is false\n");
   endif

   if ~A
      printf ("~A is true\n");
   else
      printf ("~A is false\n");
   endif

Regards,

Vic



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