realroot(A,X)

The realroot command attempts to find a real root of A(X) numerically. If no real root can be found, null is returned.

Examples

f = x^2-5*x-2;
realroot(f,x);
	-0.372281323269014
realroot(cos(x)-x,x);
	0.739085133215161
digits(50);
	50
realroot(cos(x)-x,x);
	0.7390851332151606416553120876738734040134117589005