5.25.1 Convert to a symbolic polynomial : r2e poly2symb
r2e or poly2symb takes as argument
-
a list of
coefficients of a polynomial (by decreasing order) and a symbolic
variable name
(by default x)
- or a sum of monomials %%%{coeff,[n1,....nk] %%%}
and a vector of symbolic variables [x1,...,xk].
r2e or poly2symb transforms the argument into a symbolic
polynomial.
Example with univariate polynomials, input :
r2e([1,0,-1],x)
or :
r2e([1,0,-1])
or :
poly2symb([1,0,-1],x)
Output :
x*x-1
Example with sparse multivariate polynomials, input:
poly2symb(%%%{1,[2]%%%}+%%%{-1,[0]%%%},[x])
or :
r2e(%%%{1,[2]%%%}+%%%{-1,[0]%%%},[x])
Output :
x^2-1
Input :
r2e(%%%{1,[2,0]%%%}+%%%{-1,[1,1]%%%}+%%%{2,[0,1]%%%},[x,y])
or :
poly2symb(%%%{1,[2,0]%%%}+%%%{-1,[1,1]%%%}+%%%{2,[0,1]%%%},[x,y])
Output :
x^2-x*y+2*y