n-th root of a DD real number
r = ddnrt(a,n)
DD number
integer > 0
DD number
return a n-th root of a
.
--> a = ddrand(1,1)*100 a = 6.561381467862602087669074544900E1 --> r = ddnrt(a,3) r = 4.033342437368291873928469084975E0 --> (r*r*r-a).hi ans = -7.889D-31