Arrayfire Bessel Functions

Question

I am trying to understand the syntax of the bessel functions defined in the arrayfire documentation provided here: http://archive.arrayfire.com/arrayfire/c/group__image__func__c__bessel.htm#gaa625037807cb75ef8815051c066e9657

Under the section for af_besselj_C, I am uncertain what this "nu" term is. I understand the out and in arrays, and I believe the "n" is for the order of the bessel function. Does anyone know what this "nu" term represents? Thanks!

A friendly reminder that Bessel functions are in the [standard library](https://en.cppreference.com/w/cpp/numeric), and that you should read [help/on-topic]. — Passer By, Jul 16 '18 at 19:07

score 0 · Answer 1 · answered Jul 16 '18 at 18:41

It's a bit difficult to tell based on the documentation, but it looks like the unsigned n value is probably the input/output array size, while the nu is the actual subscript n for J_n(z). The documentation has the example

float ha[] = {1, 2, 3, 4, 5};
array a   = array(5, 1, ha);
array out = array(5, 1, f32);
float* p_in  =   a.device<float>();
float* p_out = out.device<float>();
// Modified first kind
af_besseli_S(p_out, 5, p_in, 2.0);

Arrayfire Bessel Functions

1 Answers1