Wavelet peak detection VI give inconsistent results

[george seifert]

I'm using the WA Multiscale Peak Detection VI to do some peak detection. I've enclosed my VI that does this. On the block diagram I have to sets of data (far left) labeled "Works" and "Misses first peak". The data looks very similar, but as the labels imply, one finds the peaks correctly and the other misses the first very obvious peak. If I change the "Width" input to the VI down to 2 then it will work with the second set of data. Unfortunately then it detects too many peaks. Even so, with the data sets being so similar it seems it should detect the first peak on both sets of data. I'd really appreciate it if someone could run the VI and tell me what I'm missing.

Download File:post-2786-1220546637.vi

Thanks,

George

[Neville D]

I don't know what your doing, but it seems to work OK when I tried it. I had to disconnect the inflectiondata type def to make it work, & added a boolean to select between the two data sets; here is my edited version to compare with.

Neville.

[LAVA 1.0 Content]

On my computer (windows XP) I get on both version (George's and Neville's) the same result.

To easily see the difference between the two actions connect the 'peak plot' output to an XY graph:

In this screenshot you can see the peaks found and the data. I suggest you sent this data to NI so they can examin.

Ton

[george seifert]

QUOTE (Ton @ Sep 4 2008, 04:16 PM)

In this screenshot you can see the peaks found and the data. I suggest you sent this data to NI so they can examin.

Ton

Thanks for checking it out. I'll contact NI.

George

[dong1]

Georges

I'm interesting in using your vi .Unfortunately it is in labview 8.6. Could you send it to my attention in 8.5 ?

My email is

domgrange@freescale.com

thanks in advance

Dominique

[george seifert]

QUOTE (dong1 @ Nov 10 2008, 07:16 AM)

Georges

I'm interesting in using your vi .Unfortunately it is in labview 8.6. Could you send it to my attention in 8.5 ?

My email is

domgrange@freescale.com

thanks in advance

Dominique

NI has told me that there's a problem with the Wavelet peak detection VI so I really wouldn't recommend using it. My VI was just an example that used NI's VI to illustrate the problem I was having.

George