How to correctly use the outputs of Gaussian Peak Fit?

[ThomasGutzler]

I use the Gaussian Peak Fit.vi on data with very few points.

To get an idea of what the fitted curve looks like and to double check how well it performed, I wrote some extra code that is using the outputs of the vi to generate a nice curve with a few more (say 100) points on the x axis. Then I display the original data, the "Best Gaussian Fit" output and the curve calculated from the output parameters on the same graph:

I expected the four points of the red curve to be exactly on top of the green curve - but they're not.

Here's the block diagram (also attached as LV2012 VI: GaussFit.vi).

What am I doing wrong?

[Darin]

From squinting on my iPhone I can tell that your constant '2' should be sqrt(2).  Looks good otherwise.

[ThomasGutzler]

Oh, how embarrassing :/

Thanks Darin

[Luiza]

Hello Thomas, would you mind to upload also a version of your program to a 2011 version? It would help me a lot!
Thanks in advance!

Luiza

[infinitenothing]

Someone should make a internet drop box type app for conversion. Until then, there's always http://forums.ni.com/t5/Version-Conversion/bd-p/VersionConversion.

 

I've taken it back to 2009.

[ThomasGutzler]

Thanks for doing the conversion.

Finally pays out to be in a GMT+10 time zone where we sleep while the forum is active

[ShaunR]

Someone should make a internet drop box type app for conversion. Until then, there's always http://forums.ni.com/t5/Version-Conversion/bd-p/VersionConversion.

 

I've taken it back to 2009.

 

You didn't migrate make Darins change of replacing the "2" constant. The back-port has the original bug.

[Yair]

Someone should make a internet drop box type app for conversion.

 

Somewhat ironically, Darin did exactly that, although that's not public. There's also this - https://labviewhacker.com/revert/ (edit - which I see is floated in the conversion board you linked to).

Edited June 28, 2015 by Yair