Currently, I'm looking for some sites or forums that suitable to asking about math problems like differential equations, numerical methods in MATLAB.

I've tried MATLAB Community to ask about it, but lastly, I asked about 14th order Runge-Kutta and the code about 20th Adam-Bashfort-Moulton, for the second time my question was not answered. Most of them just care about how to operate MATLAB in advance programming, and not always about math.

I've tried Stack Overflow, Computational Science, Math Exchange, my question will end up with downvote and off-topic. And I'm afraid, some people would think I was asking for an answer for homework, even if it's NOT.

The following is an example of my question what I'm talking about:

https://scicomp.stackexchange.com/q/34035/33547

Where exactly can I find it?