Inflection point

[MathiasV]

Hey,

I am a total rookie with this program and I was wondering how could you find the inflection point of a parabola in DIAdem. I have a graph, which I smoothed out a little, with the basic smooth function. Now I would like to find the inflection point between x=0.06 and x=0.08. How could I do that? My end goal is to find first, second, third and fourth derivative of the inflection point and use them and Taylor Polynomial to construct a similar function to that graph. (any tips are welcomed!)

Mathias

[Brad_Turpin]

Hi Mathias,

It looks like you may have taken that screenshot in the DIAdem VIEW panel.  If so, you can use the "Minimum Values Cursor" to jump from local minimum to local minimum, and if you show the "Coordinate" pop-up dialog, you can copy and paste the X and Y values of those local minima to whatever destination.

On the other hand, if your goal is to create a Taylor expansion fit, why not try the "Approximate" dialog in the "Curve Fitting" dialog of the DIAdem ANALYSIS panel?

Brad Turpin

Principal Technical Support Engineer

NI

[MathiasV]

Thanks, Brad, for enlightening me on the ´Approximation´ dialog. However, I noticed that there is an option to choose ´evaluation points´, which the approximation is approximated on. Is it possible to choose specific points, which the approximation is derived from? 

Cheers

Mathias

[Brad_Turpin]

Hi Mathias,

Yes, if you select the "Use Channel" option under the "Create evaluation points" drop-down enumeration control, you can think pick an existing channel in the Data Portal which contains exactly the X values you want to evaluate the approximation at.

Brad Turpin

Principal Technical Support Engineer

NI