'Variance PtByPt.vi' generates values of negative values for some input

With certain sequences of input values the Gap PtByPt.vi can generate negative values. It is because of the precision in calculations.

Because it is very common to calculate the gap by taking the square root of the variance, this behavior can take you by surprise because the result will be Nan and not almost 0 you expect. According to the data, this may be frequent or very frequent. In general, a nuisance to debug.

The remedy is simple: take the Abs() before the square root value. A vi that demonstrates the case is attached.

I would suggest to include this correction (or similar) in the "Variance PtByPt.vi' because it gives rise to unexpected and hard to find errors.

By definition - variance cannot be negative.

CAR 446514 discussed in this thread has been corrected in LabVIEW 2014.  For a more complete list of bugs fixed in LabVIEW 2014, see 2014 LabVIEW bugfixes. You can download a copy of LabVIEW 2014 evaluation at http://www.ni.com/trylabview/ or if you have a previous version of LabVIEW installed and an active subscription to SSP, you will be able to download the latest version of LabVIEW through NI Update Service.

Kind regards

Jeff Peacock

Product Support Engineer | LabVIEW R & D | National Instruments | Certified LabVIEW Architect

Tags: NI Software

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