Compare number 0

I noticed something special in the TS 4.1.

When I have a few, like 1e-14, the following comparisons take in an expression:

  • Locals.VerySmallNumber == 0-> False
  • Locals.VerySmallNumber is 0.0-> False
  • 0 is Locals.VerySmallNumber-> True
  • 0.0 is Locals.VerySmallNumber-> True

I could have understood the (0 ==...) bit as a conversion of data types C-style implicit that the statements have in general C operator syntax, but 0.0 c would be a double literal and must therefore compare fake at that level of precision. But apparently it depends on sequence?

  • This behavior is normal?
  • Is this true in all versions of TestStand?
  • Is it possible to apply a comparison with double-precision regardless of the sequence (it may be a weird hang-up, but we would like to have the constant as a point of comparison in front of the operator to avoid the stupid "Variable = 0" instead of "Variable == 0" error)?

See the file attached sequence

Best regards

Peter

In TestStand, comparisons are conducted at about 14 decimal places of precision of floating point.

However, there is a known inconsistency which applies only to comparisons between a number that is EXACTLY equal to zero and a very small number that is approximately 1e-14 or less. In this case, if TestStand considers the numbers to be equal to depends on which side of the comparison, the zero accurate on.

This will be fixed in a future version of TestStand.

Tags: NI Software

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