Implements conv(a,b) along the fast axis \na [file] : is taken from stdin \nb [file] : is taken from "flt" \nRequires both files to have the same sampling interval \n \nmode [string]: \n\'full\': returns an M+N-1 array, boundary effects are visible. \n\'same\': returns a max(M,N) array, boundary effects are visible. \n\n