varn

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