How to compare 3 values in array

Hi all
This is my first post so please be tolerant
I need to find "bad values" in array, it will be easier to explain it using example so:
I have array like this: 0 0 0 0 0 0 0 0 5 0 0 0 0 <- so "5" is the bad value, my method is to check two of nearby values so x(i-1) = 0, x(i)=5 x(i+1)=0, and if checked value is more than 25% bigger or smaller it should be replaced by average of neighborhood.
next example: 0 1 2 3 4 9 6 7 8 <- bad value is 9, and result of my filter should be (4+6)/2 = 5
I've done it using formula node (not 20% and not average, but the point is the same) and it's working but now I want to do it without C and I had lots of problems with memory cause the size of array is 10000.
I attached vi and signal thah you can check that it's working fine
Thanks
Mike
Solved!
Go to Solution.
Attachments:
vi+signal.zip ‏62 KB

MeeHow wrote:
next example: 0 1 2 3 4 9 6 7 8 <- bad value is 9, and result of my filter should be (4+6)/2 = 5
Shouldn't e.g. the value 4 be outside too, because the average of 3 and 9 (=5.5) is more that 25% different to 4?
Here is a quick draft comparing three versions (LabVIEW 8.2):
Your formula node version
the same algorithm in G
Something along the lines you are proposing here.
As you can see, the new idea is not quite satisfactory. It needs more thought. Still, these drafts should give you some ideas how to do it. Modify as needed.
Also your data is similar to a square wave and has these large step functions where the value changes dramatically. These should probably be ignored. Maybe you should look at the first derivative and replace parts where a large positive slope is immediately followed by a negative slope of similar size, for example.
You should also look at absolute steps instead of percentages. If you use percentages and the value is zero, everything is outside, because even 5000% of zero is still zero, right?
LabVIEW Champion . Do more with less code and in less time .
Attachments:
filter testMOD.vi ‏41 KB

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