isolating intervals for real roots of a polynomial
univariate polynomial with integer coefficients
(optional) maximal size of each isolating interval
The command realroot(poly, widthgoal) returns a list of isolating intervals for all real roots of the univariate polynomial poly. The width of the interval is less than or equal to the optional parameter widthgoal, a positive number. If widthgoal is omitted, the most convenient width is used for each interval returned.
Each interval is returned as a list of two rational numbers. The list a,a represents the single point a. The list a,b with a<b represents the open real interval defined by a and b. Multiplicity information is not included. The denominators of a and b are integer powers of 2.
The intervals are sorted in ascending order.
The algorithm behind realroot uses Descartes' rule of signs.
Loos and Collins, Computer Algebra, B. Buchberger, ed.
Download Help Document
What kind of issue would you like to report? (Optional)
Thank you for submitting feedback on this help document. Your feedback will be used
to improve Maple's help in the future.