deconv Deconvolve two vectors. [b,r]= deconv (y, a) y: Input vector. The convolution of a and b. a: The input vector. b: The quotient polynomial coeffecients vector. r: The remainder polynomial coefficients vector. [b, r] = deconv (y, a) solves for b and r such that y = conv (a, b) + r. If y and a are polynomial coefficient vectors, b will contain the coefficients of the polynomial quotient and r will be a remainder polynomial of lowest order.