Natural logarithm which curve fit to use?

[Murph · Accepted solution]

This might have been more of a case of my poor explanation.

The attached vi solves the problem.

Now if I could only figure out how to plot a line from the start poit Y to the endpoit Y I'd be laughing.

[altenbach]

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Murph wrote:

Now if I could only figure out how to plot a line from the start poit Y to the endpoit Y I'd be laughing.

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What kind of line? According to the best fit? A straight line?

[Murph]

Spoiler

I'll try to explain.

The need for best fit was to determine a proper stop point. Once calculated we find the intersecting Y value there.

The end result is that we start at one y point on the baseline but finish on another.

The line I need might be easier to see in the attached pdf

[altenbach]

Just generate another 1D array that contains NaN for all points outside the range and a liner ramp inside the range, the add it as a second plot to the graph using build array. That's easiest.

(A fancier solution would be using the "plot images" feature that allows using picture tools on graphs)