Converts numbers in bigfloat
y=symb(x,prec)
can be of type int, double, complex, string, sym, polynomial
is the required precision
is of type sym
The function symb (b as bigfloat) converts with an arbitrary precision a number into bigfloat.
symb('%pi',314) F=sym(5);symb((1+sqrt(F))/2,100)