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