POLY

 

 Characteristic polynomial.

  If A is an N by N matrix, POLY(A) is a row vector with

  N+1 elements which are the coefficients of the

  characteristic polynomial, DETMMQSU2(lambda*EYEMO0DU2(A) - A) .

  If V is a vector, POLY(V) is a vector whose elements are

  the coefficients of the polynomial whose roots are the

  elements of V . For vectors, ROOTS7H4N0HR and POLY are inverse

  functions of each other, up to ordering, scaling, and

  roundoff error.

  ROOTS7H4N0HR(POLY(1:20)) generates Wilkinson's famous example.

 

 

  See also ROOTS7H4N0HR, POLYVAL8CDZ095.