Running average - that old chestnut!

[ASH2020]

Hi all. I have been searching the forum for examples of a boxcar average but can't find anything that suits.

Let's say I have a continuous stream of data coming in at the left and a wire to a waveform chart at the right. I haven't done a vi because it's that simple. I don't know how many data points there will be.

All I want is a black box to insert in the wire that will give me a running average of n points, probably around 5. I don't want the source or the indicator to be inside any loop.

Nearly all of the examples have either a number generator and display inside a loop, or a fixed length array of data points to work on. I just want the data stream coming in, averaged as it goes, and going out. I'm sure it can't be too difficult.

Thanks for any help.

Andy.

[altenbach]

Use "mean ptbypt" with a value of 5.

[Ben]

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@altenbach wrote:

Use "mean ptbypt" with a value of 5.

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Spoiler

You KNOW it is a simple question if Christian's reply would fit in a tweet.

Ben

[altenbach]

Actually, mean ptbypt seems to require at least LabVIEW full, but it would be trivial to create a subvi that does the same.

[ASH2020]

Thank you for that quick reply.

I'm afraid to say I fed you a bum steer, or I didn't explain it properly. The data is coming in packets in the form of a 1D array, of n length, (n is unknown) so I guess I would have to use "Array Size" and then step through it in a loop of n iterations?

Cheers

[altenbach · Accepted solution]

Just place mean ptbypt (and chart) inside an autoindexing for loop. No need to get the size.

[ASH2020]

I'm using Labview full and it works. Excellent.

[ASH2020]

Thanks altenbach. Much appreciated.

Cheers

Andy