Doubt about Fitting

[nigeltorque]

Hi everybody 

i have a little doubt about the "Linear Fit .vi"; i see the help page and i undestand that it takes a set of value X and Y and makes out the best fitting of the Y value. I tried to use it in a project and:

In the first block (the upper one) it takes a data set (X,Y) and makes the fit..ok!

In the second one (the lower one) it takes a ramp signal + noise data in the Y input and just the ramp signal in the X input.. how can he makes the fit? 

It takes the same signal, how can it read the x value and the y value ? If i have a waveform in "dynamic data set" how can i separate the X and Y component? can i put the same signal in the X and Y input ?

I hope to be clear.. i just want to know how can the .vi read several kind o input.

Thank you

[nigeltorque]

I post the attachement in older version too..

[nigeltorque]

Is it possible to see the .vis ?? Is the first time i save one in an older version, hope you are able to see it!

[johnsold]

What values are you using for the model parameters? Start, End, Samples, Delta, Amplitude, Method 2?  The defaut values produce an Equation of Fit 2 with NaN.

The VIs in the 8.6 version came through.

Lynn

[altenbach]

Use a delta that is not zero.