Has anybody implemented code to extract coefficients for a Butterworth low-pass filter? I know Matlab has it implemented in the signal toolbox. I want to make use of a 10 point Butterworth low-pass filter for smoothing. In Matlab the code would look like this: % Determine the filter coefficients [b,a]=butter(10,0.1) % Apply the filter to the input outdata = filter (b,a,indata); The archives contain similar questions but if somebody responded, they did it off-list. Thanks in advance, Andy