Function approximation using "A Novel Adaptive Kernel for the RBF Neural Networks"

This submission is a part of a paper titled as "A Novel Adaptive Kernel for the RBF Neural Networks" [1]. In this simulation I implemented function approximation problem. Function approximation problem is similar to the regression problem. Here in this case I used two input single output case, it can be easily extended to higher values.
Please Cite
[1] Khan, S., Naseem, I., Togneri, R. et al. Circuits Syst Signal Process (2017) 36: 1639. doi:10.1007/s00034-016-0375-7
https://link.springer.com/article/10.1007/s00034-016-0375-7