how to find the shape change of a curve

[Ramsgt]

Dear All,

I need to find the point where the curve got deviated. I Tried Calculating Slope It Is Not useful. Share Some Ideas to sort out this problem.

Find the attached vi and the TDMS file read the file with default group name and let me know the result.

Thanks and regards,

Rams.

[ABCPrograms]

1st derivative?

[altenbach]

You don't define what you mean by "deviate". Deviate from what? From zero? From a straight line?

Your curve has a couple of places where the slope changes, can you tell us which one you want?

First is it horizontal, then

starts sloping upward. (x=~1.0)

changes in slope (x=~1.4)

another change in slope (x=~1.9)

In what way is calculating the slope "not useful"?