Can LabView compare two curves?

[Hiroshi Shimase]

Hi,

Now I'm making software to compare two curves are similar
or not. Those curves can be shifted a bit but I want to see
if these "shapes" are identical.

Does LabView have capability to see similarity for two curves
or any theory around here?

Dan,

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Hiroshi Shimase (Oji Paper + Howe Sound Pulp & Paper)

TEL : 604-886-3579(home) 604-884-2491(office)
Home : hiroshi_shimase@dccnet.com or hiroshi_shimase@mac.com
Office: hshimase@mail.canfor.ca
WEB : http://www.geocities.co.jp/SiliconValley-PaloAlto/4268/
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[alkazaa]

You can calculate the cross-correlation function between the two curves
to estimate
their "similarity". Labview has (in the Advanced Analysis Library) two
VIs that should do
the job:
- in the function menu 'Signal Processing-->Frequency Domain-->Cross
Power.vi' computes
the cross-correlation power spectrum
- in the menu 'Signal Processing-->Mesaurements-->Cross Power
Spectrum.vi', which computes
Magnitude and Phase of the cross power spectrum

Both require that the signals X(t) and Y(t) are sampled at equal
t-values.

If you don't have the Advanced Analysis Library, try to get it


-Franz

Hiroshi Shimase schrieb:

> Hi,
>
> Now I'm making software to compare two curves are similar
> or not. Those curves can be shifted a bit but I want to see
> if these "sh
apes" are identical.
>
> Does LabView have capability to see similarity for two curves
> or any theory around here?
>
> Dan,
>
> -------------------------------------------------------------------
> Hiroshi Shimase (Oji Paper + Howe Sound Pulp & Paper)
>
> TEL : 604-886-3579(home) 604-884-2491(office)
> Home : hiroshi_shimase@dccnet.com or hiroshi_shimase@mac.com
> Office: hshimase@mail.canfor.ca
> WEB : http://www.geocities.co.jp/SiliconValley-PaloAlto/4268/
> -------------------------------------------------------------------