Deconvolution and polynomial division.
[Q,R] = DECONV(B,A) deconvolves vector A out of vector B. The result
is returned in vector Q and the remainder in vector R such that
B = conv(Q,A) + R.
If A and B are vectors of polynomial coefficients, deconvolution
is equivalent to polynomial division. The result of dividing B by
A is quotient Q and remainder R.
See also CONV15XZUU2.