power trend line (Power Fit vi)

[kalachnik]

Hello all,

I would much appreciate if someone could shed some light on my dilemma.

I am trying to create a power trendline within Labview on sample data, that matches Excel's trendline with the same sample data.

I have attached the vi and a picture of the excel plot to show the difference. 

It is like the excel trend line is some sort of interpolation algorithm that i do not understand how to imitate in labview.

If anyone has any suggestions to make Labview imitate Excel, that would be much appreciated.

Thanks.

[altenbach]

You simply need to generate a x ramp with more data, apply the model wit the best fit based on the paramters, and  plot it.

[altenbach]

Try this....

[kalachnik]

Thanks for the reply.

I noticed that the equation of the trend lines still do not match (Labview vs Excel). Just having a look now, to see why.

[altenbach]

Look at the residual. The excel fit is pretty poor, especially for the third point.

[kalachnik]

Thanks!

I see the errors in my way now.

Cheers.

[empoy]

How did you address the issue?