random

问题 I need to generate a big array (or list) with random numbers ( 10⁵ numbers) . I was trying like that: vet = random.sample(range(10),100000) But when I try to run : vet = random.sample(range(10),10000) File "/usr/lib/python2.7/random.py", line 320, in sample raise ValueError("sample larger than population") ValueError: sample larger than population Any solution? tkns 回答1: What you want is [random.random() for _ in xrange(100000)] From the random module documentation: random.sample(population,

问题 I need to generate a big array (or list) with random numbers ( 10⁵ numbers) . I was trying like that: vet = random.sample(range(10),100000) But when I try to run : vet = random.sample(range(10),10000) File "/usr/lib/python2.7/random.py", line 320, in sample raise ValueError("sample larger than population") ValueError: sample larger than population Any solution? tkns 回答1: What you want is [random.random() for _ in xrange(100000)] From the random module documentation: random.sample(population,

问题 I'm having a hard time with Sphinx where it won't import all the modules. There error it is encountering reads as follows: File “file path”, line 36, in Individual ml_params = {'C': random.choice(svr_C), 'gamma': random.choice(svr_gamma)} File "/usr/local/Cellar/sphinx-doc/3.1.1/libexec/lib/python3.8/random.py", line 290, in choice raise IndexError('Cannot choose from an empty sequence') from None IndexError: Cannot choose from an empty sequence I set sphinx up per the instructions in the

问题 I have a block of code with import random as r value = r.choice(r.randint(10, 30), r.randint(50, 100)) print (value) Why does it give me the following error, and how should I fix it? TypeError: choice() takes 2 positional arguments but 3 were given 回答1: choice takes a sequence of items to choose from, not varargs. Wrap the arguments to make an anonymous tuple or list and it'll work, changing: value = r.choice(r.randint(10, 30), r.randint(50, 100)) to either of: value = r.choice((r.randint(10,

问题 I have a block of code with import random as r value = r.choice(r.randint(10, 30), r.randint(50, 100)) print (value) Why does it give me the following error, and how should I fix it? TypeError: choice() takes 2 positional arguments but 3 were given 回答1: choice takes a sequence of items to choose from, not varargs. Wrap the arguments to make an anonymous tuple or list and it'll work, changing: value = r.choice(r.randint(10, 30), r.randint(50, 100)) to either of: value = r.choice((r.randint(10,

问题 I have prepared a code in Python to do random sampling of beam structure and looking for photons. The evolution of photons with time follows a Poisson distribution. The beam structure I am simulating has 936 bins with first 900 bins having charge of 0.62 nC followed by a gap of 36 bins. Each bin is of 2 ns which means total revolution period of the beam (to complete one circle of synchrotron) is 1.872 microseconds (936 bins time 2 ns). We look for probability of getting photons in each bin.

问题 I'm trying to develop a hangman as an assignment, and is unable to get one random word from a Text file(which has various words and each word is separated with a space). I've written a code to get a random word, but unable to pick one words and replace it, with the sample string (String w = "this";) i have in the "Function()". public String randomWord(String wordran) { try { BufferedReader reader = new BufferedReader(new FileReader("C:\\Users\\Admin\\Documents\\NetBeansProjects\\Main\\words

问题 This question already has answers here : Why do I always get the same sequence of random numbers with rand()? (12 answers) Closed 7 years ago . I'm working on an application. I'm using: int rand_num = rand() % 100; To get a random integer between 0 to 99. Now, let's say I got 41, then restarting my application, it's always 41. Same sequence over and over, means it's not really random. Any solutions? 回答1: rand generates a pseudo-random number, yes. But you can set the seed. srand(time(NULL));

问题 I am using jQuery to apply background-images to randomly selected DIV elements. The problem is that I want to make sure that no two DIV elements can have the same background-image at any given time. So when the code chooses a DIV to apply the background-image, it should also check if any of the DIVs are already using that image in that moment. I have put together a piece of code with a lot of help from others while searching for a solution, but it does not check if any of the DIVs are already

问题 I am trying to sample around 1000 points from a 3-D ellipsoid, uniformly. Is there some way to code it such that we can get points starting from the equation of the ellipsoid? I want points on the surface of the ellipsoid. 回答1: Here is a generic function to pick a random point on a surface of a sphere, spheroid or any triaxial ellipsoid with a, b and c parameters. Note that generating angles directly will not provide uniform distribution and will cause excessive population of points along z