Analysis.Math.Statistics fails when NaN values are included in the entry tables

Hi all..

With the help of Measurement Studio to Version 8.9 of .net. We need calculate statistics on a table that contains a double. NaN values. When I do this I get NaN as the result of any of the statistical methods (average, STDS etc.) ... Interestingly, the Math.ArrayOperations methods look like they work. Any ideas?

Thank you

gdssoftware

Hi GDSSoftware,

You see this behavior because the statistical functions with Measurement Studio ignore not input values NaN - that is why, they will return results NaN.  To work around this problem, you will need to filter these NaN values out of your input array before performing statistical analysis on this subject.

If you're working with .NET 3.5 and later versions, you can do this by using the following:

Double [] vals = new double [] {0d, 6 d, 10 d, 4 d, double. NaN};
Double [] nanless_vals = vals. Where (d =>! double.) IsNaN (d)). ToArray();

If you use an earlier version of the .NET framework, you will need to perform a loop on the table with the following (or something similar):

Double [] vals = new double [] {0d, 6 d, 10 d, 4 d, double. NaN};
List nanless_list As new List();
for (int i = 0; i)< vals.length;="">
If (! double.) IsNaN (vals [i]))
nanless_list. Add (Vals [i]);
Double [] nanless_vals is nanless_list. ToArray();

I hope this helps!

Kind regards

Stephanie R.

National Instruments

Tags: NI Software

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