How to construct a polynomial from string?
I can run the following (putting in a .sage file) successfully.
R.<x> = QQ
f = x^3 - x^2 + x -1
p = x - 2
But how about I have a string 'x^3 - x^2 + x -1', how can I construct f.
f = SR('x^3 - x^2 + x -1') is not working as there is no member function quo_rem for Expression.