c#中低通和高通滤波器。

I need low pass and high pass filter written in c#. I have double arrays for this filter process. I think if I try to convert matlab Butterworth and Chebyshev algorithms to c#, it would be easier. But I couldn't find the code of butter.m and Chebyshev algorithms on the internet and I don't want to set up matlab and signal processing toolbox into my computer. Could you provide that codes please? Thanks.. I need low pass and high pass filter written in