varn

symbolic variable of a polynomial

Calling Sequence

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

Arguments

:p polynomial (or polynomial matrix) : :symb character string : :x polynomial or polynomial matrix : :var symbolic variable (character string) : :pm polynomial (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 polynomial/rational evaluation
• poly polynomial definition