Find greatest common divisor of two polynomials. This is equivalent to the polynomial found by multiplying together all the common roots. Together with deconv, you can reduce a ratio of two polynomials. Tolerance defaults to
sqrt(eps).Note that this is an unstable algorithm, so don't try it on large polynomials.
Example
polygcd (poly(1:8), poly(3:12)) - poly(3:8) [ 0, 0, 0, 0, 0, 0, 0 ] deconv (poly(1:8), polygcd (poly(1:8), poly(3:12))) ... - poly(1:2) [ 0, 0, 0 ]