Query/set the state of the random generator. maybe/0Succeed/fail with equal probability (variant of maybe/1). maybe/1Succeed with probability P, fail with probability 1-P. maybe/2Succeed with probability K/N (variant of maybe/1). random/1Binds R to a new random float in the _open_ interval (0.0,1.0). random/3Generate a random integer or float in a range. random_between/3Binds R to a random integer in [L,U] (i.e., including both L and U). random_member/2X is a random member of List. random_numlist/4Unify List with an ascending list of integers between L and U (inclusive). random_perm2/4Does X=A,Y=B or X=B,Y=A with equal probability. random_permutation/2Permutation is a random permutation of List. random_select/3Randomly select or insert an element. random_subseq/3Selects a random subsequence Subseq of List, with Complement containing all elements of List that were not selected. randseq/3S is a list of K unique random integers in the range 1..N. randset/3S is a sorted list of K unique random integers in the range 1..N. setrand/1Query/set the state of the random generator.

F.2.44 library(rbtrees)

is_rbtr