random

问题 So sCount is the number of elements in the source array, iCount is the number of elements I want to remove. let indices = Array.init iCount (fun _ -> rng.Next sCount) |> Seq.distinct |> Seq.toArray |> Array.sort The problem with the method above is that I need to specifically remove iCount indices, and this doesn't guarantee that. I've tried stuff like while indices.Count < iCount do let x = rng.Next sCount if not (indices.Contains x) then indices <- indices.Add x And a few other similar

问题 I have a game implemented in Unity/C# that generates simple environments using the built-in PRNG ( UnityEngine.Random ). I am trying to reimplement the environment generation procedure in Python 3. I need the random number generators to be synchronized so that when provided with the same seed, the actual game in Unity and the Python reimplementation generate the exact same environment. What would be the best approach to synchronizing the two platforms? Some solutions I have considered so far:

问题 I have a game implemented in Unity/C# that generates simple environments using the built-in PRNG ( UnityEngine.Random ). I am trying to reimplement the environment generation procedure in Python 3. I need the random number generators to be synchronized so that when provided with the same seed, the actual game in Unity and the Python reimplementation generate the exact same environment. What would be the best approach to synchronizing the two platforms? Some solutions I have considered so far:

问题 Since C++11 there are a number of std random number engines. One of the member functions they implement is void discard(int long long z) which skips over z randomly generated numbers. The complexity of this function is given as O(z) on www.cplusplus.com (http://www.cplusplus.com/reference/random/mersenne_twister_engine/discard/) However, on www.cppreference.com (http://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine/discard) there is a note to say that For some engines, "fast

问题 This question already has answers here : Generating Unique Random Numbers in Java (21 answers) Closed 4 years ago . I have been banging my head for two days now trying to make sure the random generator method won't generate a duplicate. This I had to do with loops only without importing any libraries. I have come to this solution, will this code generate a duplicate on the long run? If yes please help. int[] vargu1 = new int[5]; for (int i = 0; i < vargu1.length; i++) { int numriSekret = (int

问题 All the integer functions in math/rand generate non-negative numbers. rand.Int() int // [0, MaxInt] rand.Int31() int32 // [0, MaxInt32] rand.Int31n(n int32) int32 // [0, n) rand.Int63() int64 // [0, MaxInt64] rand.Int63n(n int64) int64 // [0, n) rand.Intn(n int) int // [0, n) I would like to generate random numbers in the range [-m, n) . In other words, I would like to generate a mix of positive and negative numbers. 回答1: I found this example at Go Cookbook, which is equivalent to rand.Range

问题 All the integer functions in math/rand generate non-negative numbers. rand.Int() int // [0, MaxInt] rand.Int31() int32 // [0, MaxInt32] rand.Int31n(n int32) int32 // [0, n) rand.Int63() int64 // [0, MaxInt64] rand.Int63n(n int64) int64 // [0, n) rand.Intn(n int) int // [0, n) I would like to generate random numbers in the range [-m, n) . In other words, I would like to generate a mix of positive and negative numbers. 回答1: I found this example at Go Cookbook, which is equivalent to rand.Range

问题 I want to generate x and y having a uniform distribution and limited by [xmin,xmax] and [ymin,ymax] The points (x,y) should be inside a triangle. How can I solve such a problem? 回答1: Here's some code that generates points uniformly on an arbitrary triangle in the plane. import random def point_on_triangle(pt1, pt2, pt3): """ Random point on the triangle with vertices pt1, pt2 and pt3. """ s, t = sorted([random.random(), random.random()]) return (s * pt1[0] + (t-s)*pt2[0] + (1-t)*pt3[0], s *

问题 I want to generate x and y having a uniform distribution and limited by [xmin,xmax] and [ymin,ymax] The points (x,y) should be inside a triangle. How can I solve such a problem? 回答1: Here's some code that generates points uniformly on an arbitrary triangle in the plane. import random def point_on_triangle(pt1, pt2, pt3): """ Random point on the triangle with vertices pt1, pt2 and pt3. """ s, t = sorted([random.random(), random.random()]) return (s * pt1[0] + (t-s)*pt2[0] + (1-t)*pt3[0], s *

问题 I want to generate x and y having a uniform distribution and limited by [xmin,xmax] and [ymin,ymax] The points (x,y) should be inside a triangle. How can I solve such a problem? 回答1: Here's some code that generates points uniformly on an arbitrary triangle in the plane. import random def point_on_triangle(pt1, pt2, pt3): """ Random point on the triangle with vertices pt1, pt2 and pt3. """ s, t = sorted([random.random(), random.random()]) return (s * pt1[0] + (t-s)*pt2[0] + (1-t)*pt3[0], s *