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).

Examples

// 
s=poly(0,'s');p=[s^2+1,s];
varn(p)
varn(p,'x')
 

See Also

horner  poly