average value again

[maria2]

Hi,

In order to use the block for determining the DC or RMS value of an input signal, I need the files Dot Product.vi and Real Dot Product.vi. Can anyone post them here?

Thank you

[Dennis_Knutson]

This is another VI that should be included with the base version of LabVIEW. See if you have \vi.lib\analysis\baseanly.llb on your pc. If you don't, then I would recomend reinstalling LabVIEW. If you're missing this, you may have a lot of other functions missing and it's probably easier for everyone if you reinstalled instead of asking for the missing VIs.

[maria2]

Hello,

I did it and that library doesn't even come with my Cds. It's LabView 7.1 for Windows XP. Is it downloadable from NI web page?

Thanks!

[Dennis_Knutson]

I'm going to have to defer to someone from NI. I have the full version of LabVIEW so of course I have all of the analysis functions. The mean and dot product functions are not tagged in the help file as (Not in Base Package). If this is incorrect and the functions are no longer part of the base package in 7.1, then all kinds of laws and license agreements would be broken by giving you those VIs and they would not be available for download. When you say that the library doesn't come with your CDs, how do you know? Did you look at the contents of the .cab files?

[maria2]

Hello,

No, what I meant was: after re-installing I still don't have those VIs. That's why I'm saying they're not on my CDs!

[Dennis_Knutson]

Assuming that you had no errors during the installation and that you had selected the full installation, then I'm not sure what else to say except I would like confirmation one way or another from NI that these functions are supposed to be part of the base package of LabVIEW.

[Jean_Philippe_R]

Hello Maria, Dennis,

This function is located in the function panel : Analyse >> Mathematics >> Linear Algebra. This is a polymorphic VI which allows you to compute a real or a complex dot product.

Regards,

JPR

NI France

[Jean_Philippe_R]

Hello Maria, Dennis,

This function is located in the function panel : Analyse >> Mathematics >> Linear Algebra. This is a polymorphic VI which allows you to compute a real or a complex dot product.

Regards,

JPR

NI France

[RockInnovations]

Hi
Can anyone help me build a moving point average filter in the base package?

I have a data-logging application working in the Labview 7 Base Package with a NI-Daq card.
I now need to calculate RMS values of AC current on Analog input channels.
I can produce the RMS algorith, but cannot work out how to create a dynamic circular buffer to store the most recent 20 or 40 samples so I can calc an average.

Thanks
Rock

[GerdW]

Hi Rock,

circular buffer is created by using a while loop with a shift register (SR)...

- init SR with needed sample count, (only in first call, when array is still empty)
- replace (!) array elements with each new sample (use iteration count "i" and quotient&remainder with array size)
- while loop only runs once per sample adding, so wire a constant to the stop condition
- sum array (after while loop), divide by array size -> running average...

When I have access to LabView I will add an example...