com.yetanalytics.datasim.util.random — com.yetanalytics/datasim 0.4.4

Random number generation and probabilistic operations.

choose clj

(choose rng weights coll)

Probabilistically select one element from coll. The weights map should be a map of coll elements numerical weights. If an element does not have an associated weight, it will be assigned a default of 0.5. Note that a weight of 0 denotes that the element can never be chosen.

choose-map clj

(choose-map rng weights m)

Probabilistically select one value from the map m. The weights map should be a map from the keys of m to numerical weights. If an element does not have a weight, it will be assigned a default of 0.5. Note that a weight of 0 denotes that the element can never be chosen.

default-weight clj

rand clj

(rand rng)

(rand rng n)

Generate a pseudorandom, uniformly distributed double value between 0 and n (both inclusive).

See also: clojure.core/rand

rand-boolean clj

(rand-boolean rng prob)

Generate a pseudorandom boolean value where true is returned with probability prob and false with probablility 1 - prob. This function can be used to realize prob, and is equivalent to generating a Bernoulli-distributed value.

rand-exp clj

(rand-exp rng lambda)

Generate a pseudorandom, exponentially distributed double value with mean (/ 1 lambda), where lambda is the so-called "rate parameter".

rand-gaussian clj

(rand-gaussian rng mean sd)

Generate a pseudorandom, normally distributed double value with mean mean and standard deviation sd.

rand-int clj

(rand-int rng n)

Generate a pseudorandom, uniformly distributed integer value between 0 (inclusive) and n (exclusive).

See also: clojure.core/rand-int

rand-nth clj

(rand-nth rng coll)

Randomly select an element from coll. Each element has an equal probability of being selected.

Will throw an ::empty-coll exception on an empty coll.

See also: clojure.core/rand-nth

rand-unbound-int clj

(rand-unbound-int rng)

Generate a pseudorandom, uniformly distributed integer value in the entire range of possible Java long/Clojure integer values.

rand-uuid clj

(rand-uuid rng)

Generate a pseudorandom UUID (as a string).

random-sample clj

(random-sample rng prob)

(random-sample rng prob coll)

(random-sample rng prob coll weights)

Probabilistically sample elements from coll, where each element has prob probability of being selected. If weights are provided, then the element associated with a weight has (+ prob weight) probability (up to 1.0) of being selected. Returns a transducer when coll is not provided.

See also: clojure.core/random-sample

rng clj

(rng)

Create a pseudorandom RNG using an arbitrary seed value.

seed-rng clj

(seed-rng seed)

Create a seeded deterministic, pseudorandom RNG, in which two RNGs created using the same value of seed will output the same results.

shuffle clj

(shuffle rng coll)

(shuffle rng coll cnt)

Randomly shuffle coll and return a lazy sequence as the result.

See also: clojure.core/shuffle