Hi, As part of Graduate program I have developed following useful functions that I like to submit to boost as a seperate library or part of math library - notable functions in my lists are, 1. ARBurg - Auto regressive coefficients using Burg's algorithm 2. ARCeps - Cepstrum coefficeint from Auto-regressive coefficients 3. 1-D filter function 4. 1-D convolution function 5. Moving - Average filter 6. Polynomial Fitting 7. Polynomial Value from Polynomial Coefficients Regards Syed Mamun Raihan 647.278.9083