ATLAB Lecture 6 School of Mathematical Sciences Xiamen University http∥gdjpkc.xmu.edu.cr k Given three input arguments(r, p, and k), residue converts back to polynomial form due(r, p, k)% x+4x+2x2+6x+8 Polynomial Function Summary Function Description Multiply polynomials decoy Divide polynomials Poly fied roots I Po olynomial derivative orval Polynomial evaluation olyvalm Matrix polynomial evaluation oots i Find polynomial roots. polyfit Polynomial curve fittingMATLAB Lecture 6  School of Mathematical Sciences Xiamen University  http://gdjpkc.xmu.edu.cn  Lec6­4  p =  ­4  ­2  k =  [ ] Given three input arguments (r, p, and k), residue converts back to polynomial form.  >> [b2, a2] = residue(r, p, k) % 2  12 8 4 8 4 2 6 8 x  x x x x - - - + = + + + + b2 =  ­4  8  a2 =  1  6  8  ² Polynomial Function Summary Function  Description  conv  Multiply polynomials.  deconv  Divide polynomials.  poly  Polynomial with specified roots.  polyder Polynomial derivative.  polyval  Polynomial evaluation.  polyvalm  Matrix polynomial evaluation.  roots Find polynomial roots.  residue Partial­fraction expansion (residues).  polyfit  Polynomial curve fitting