varn

Arguments

p

matrix of polynomials or of rationals

symb

character string: name of the variable

varname

character string: the new name of the variable of p, set for pm

pm

matrix of polynomials or of rationals

Description

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

varn(p,'s') returns a polynomial matrix with same coefficients as p 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')

f = %z / (%z-1); f = [f f^2]
varn(f)
varn(f,"x")

See also

• poly — polynomial definition
• rlist — Scilab rational fraction function definition
• horner — polynomial/rational evaluation

History