Finding the slope of a tangent to a curve

Hello everyone,
I would appreciate guidance to any specific built-in subVI or routine which I can use to draw a tangent to a curve and find its slope. Specifically, I will need to to able to draw this tangent at any user specifed y-value. In order to keep it very accurate, I will not like to use any arbitrary cursors. The curve itself is drawn from a text file data which is read and passed onto an xy-graph.
Any guidance will be much appreciated.
cheers,
Navneet
Solved!
Go to Solution.

Not really Mathan, going through it still.
For argument sake, lets assume an exponential increasing function and i want to find the slope at the point where y = 0. what will be the most optimum approach for this?
Thanks for your reply, kindly appreciated.

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How about just two sets of X Y value pairs?
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You need to incrementally measure the slope from point to point and keep
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>I'm trying to
calculate the slope of a graph aquired by a daq device.
>I have to find the part of the curve where it reaches the peak, not the
>maximum. Can anybody point out a vi or function to find an
>approximation to the peak?
>
>Best Regards
>Svavar Von Eisland
>
>
>Sent via Deja.com http://www.deja.com/
>Share what you know. Learn what you don't.

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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.
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You don't define what you mean by "deviate". Deviate from what? From zero? From a straight line?
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starts sloping upward. (x=~1.0)
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another change in slope (x=~1.9)
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Finding the slope of a tangent to a curve

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