Finding the slope of a tangent to a curve

[navneet]

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

[Mathan]

Will this help you? Post back.

Mathan

[navneet]

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.

[johnsold · Accepted solution]

If you know that an exponential is a good theoretical model for your data, then fit the data to an exponential function with one of the curve fitting VIs.  Take the derivative of the fitted function at x.  Result is slope.

Lynn