File: varn.cat

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varn(1)                        Scilab Function                        varn(1)
NAME
  varn - symbolic variable of a polynomial

CALLING SEQUENCE
  [symb]=varn(p)
  [pm]=varn(x,var)

PARAMETERS

  p         : polynomial (or matrix polynomial)

  symb      : character string

  x         : polynomial or polynomial matrix

  var       : symbolic variable (character string)

  pm        : matrix or polynomial matrix

DESCRIPTION
  symb=varn(p) returns in symb the symbolic variable of the polynomial p
  (i.e. varn(poly(0,'x')) is 'x').

  varn(x,'s') returns a polynomial matrix with same coefficients as x but
  with 's' as symbolic variable (change of variable name).

EXAMPLE
  s=poly(0,'s');p=[s^2+1,s];
  varn(p) is the string 's' and varn(p,'x') is the polynomial matrix
  [x^2+1,x]

SEE ALSO
  horner, poly