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Asked: 2026-06-11T03:23:44+00:00

My function always looks like this: y = beta1 / (1 + exp(beta2 +

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My function always looks like this: y = beta1 / (1 + exp(beta2 + beta3 * x)). With the data it can get, it always looks like a mirror of that (it starts with high values, then decreases) enter image description here
I have the values beta1, beta2 and beta3. Now I need to calculate the point of inflection. I guess I could do it with an algorithm, but are there any functions provided by a library I could use? (Currently I cannot use Accord.NET because I still have C# 3.5 and it does only support 4.+)

update I’d be fine with a method to take the derivative 😉

Best regards

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1 Answer

  1. Editorial Team

    What you need is second derivation, and if the function only differs in constants, you can pre-compute it somewhere, and then only fill in constants.

    Here you are: wolfram

    There is no standard library function that derivates for you.

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