simple moving average problem using filter express vi

[manny09]

Hi,

I am having some problems with filter express vi. I am trying to use it as moving average. 

I am feeding in a simple array of 10 numbers with the half-width of 2. But on the output, I don't get the correct filtered result. Is there something I am doing wrong here?

I have attached the sample VI I made for testing out the moving average function. 

Any help is appreciated. 

Thanks

[JÞB]

The filter Express vi does not compute a simple moving average.  It applies a smoothing filter to the data.  it is bit different.

A simple moving average can be realized with this snippette:

[manny09]

Hi Jeff,

I was trying to construct the VI according to the image you posted, but I am not sure what NaN stands for? Also, what's the subVI beside it (orange one with the arrow pointing left)

Thanks

[JÞB]

NaN stands for Not a Number.  its a special case for IEEE 754 floating point numbers as are +/-inf.   The Feedback Node can be found on the structures pallatte.

Of course, that png shown is a "snippette."  just right-click it copy it paste it to your desktop and drag it onto a block biagram.  "Poof" the code is written! and hovering over the items with Ctrl+H on will take you right to the help file.

[aputman]

Or you can use PtByPt averaging.  Found in Signal Processing >> Point by Point >> Prob & Stat >> Mean

Sorry, mine is not a snippet.  Haven't installed that yet. 🙂

[alexderjuengere]

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Sorry, mine is not a snippet.  Haven't installed that yet. 🙂

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I might be wrong, but I think the snippet is already a built-in Labview tool;

Here's a manual:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000x2PkCAI&l=en-US

Regards,
Alex

[JÞB]

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@aputman wrote:

Or you can use PtByPt averaging.  Found in Signal Processing >> Point by Point >> Prob & Stat >> Mean

Sorry, mine is not a snippet.  Haven't installed that yet. 🙂

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Not equvallent and will yeild strange results if number to average changes.  Placing Number to average outside the loop yields equivallent results(Given the same "Random numbers").  just a bit less Rube-Goldbergy

(Your Code: underneith...):

[manny09]

Thanks for the help everyone.

Looks like I got that part working now