I have data as shown below.I would like to use Labview to get the tangent in the point where Y =2.Is there any way to do this?

That is correct, the division was my mistake. When you derivate this, you need to multiply with the derivative of the internal function.

You have got the exponential function coefficients, so you got the equation: y = 9.8659 * exp(-1.27*x). Using the above function, first calculate the x value at the required y-position: (ln(9.8659)-ln(2))/1.27 = 1.25664... So you want to find the tangent at point (X_0; Y_0) = (2; 1.25664). Take the first derivative of the function, and calculate its value at "X_0". This gives you the slope of the tangent line: "m". Use the line equation: Y - Y_0 = m* (X - X_0) edit: i made a mistake, just swap the X_0 and Y_0 ! EDIT2: so to clarify: find the tangent at point (X_0; Y_0) = (1.25664 ; 2) The first derivative of the function is: y' = (9.8659/-1.27) * exp ( - 1.27 * x ) Calculate the first derivative's value at X_0 --> you get the slope "m", m = - 1.5748 Using the line equation, we get the tangent: y = -1.5748*x + 3.9789 Using LabVIEW, you can get the coefficients, and also can get the coefficients for the derivative. After that just simple math to find tangent at a certain point.

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