random

问题 I have a 2D list of booleans. I want to select a random index from the the list where the value is False . For example, given the following list: [[True, False, False], [True, True, True], [False, True, True]] The valid choices would be: [0, 1] , [0, 2] , and [2, 0] . I could keep a list of valid indices and then use random.choice to select from it, but it seems unpythonic to keep a variable and update it every time the underlying list changes for only this one purpose. Bonus points if your

问题 I have a 2D list of booleans. I want to select a random index from the the list where the value is False . For example, given the following list: [[True, False, False], [True, True, True], [False, True, True]] The valid choices would be: [0, 1] , [0, 2] , and [2, 0] . I could keep a list of valid indices and then use random.choice to select from it, but it seems unpythonic to keep a variable and update it every time the underlying list changes for only this one purpose. Bonus points if your

问题 I need to deterministically generate a randomized list containing the numbers from 0 to 2^32-1. This would be the naive (and totally nonfunctional) way of doing it, just so it's clear what I'm wanting. import random numbers = range(2**32) random.seed(0) random.shuffle(numbers) I've tried making the list with numpy.arange() and using pycrypto's random.shuffle() to shuffle it. Making the list ate up about 8gb of ram, then shuffling raised that to around 25gb. I only have 32gb to give. But that

问题 For my experiment I have 20 categories which contain 9 pictures each. I want to show these pictures in a pseudo-random sequence where the only constraint to randomness is that one image may not be followed directly by one of the same category. So I need something similar to r = randi([1 20],1,180); just with an added constraint of two numbers not directly following each other. E.g. 14 8 15 15 7 16 6 4 1 8 is not legitimate, whereas 14 8 15 7 15 16 6 4 1 8 would be. An alternative way I was

问题 For my experiment I have 20 categories which contain 9 pictures each. I want to show these pictures in a pseudo-random sequence where the only constraint to randomness is that one image may not be followed directly by one of the same category. So I need something similar to r = randi([1 20],1,180); just with an added constraint of two numbers not directly following each other. E.g. 14 8 15 15 7 16 6 4 1 8 is not legitimate, whereas 14 8 15 7 15 16 6 4 1 8 would be. An alternative way I was

问题 i know this might seem silly, but i want to generate a random code of 8 characetrs, only numbers or letters using php. i needs this to generate a password for each user that signs up, thanks 回答1: I would rather use md5 to generate passwords But you can use something like this if you want a custom: function createRandomPassword() { $chars = "abcdefghijkmnopqrstuvwxyz023456789"; srand((double)microtime()*1000000); $i = 0; $pass = '' ; while ($i <= 7) { $num = rand() % 33; $tmp = substr($chars,

问题 I am currently working on building a classifier using c5.0. I have a dataset of 8000 entries and each entry has its own i.d number (1-8000). When testing the performance of the classifier I had to make 5sets of 10:90 (training data: test data) splits. Of course any training cases cannot appear again in the test cases, and duplicates cannot occur in either set. To solve the problem of picking examples at random for the training data, and making sure the same cannot be picked for the test data

问题 Is it possible to generate 'Random number' variables in JMeter? I have recorded a user journey I have imported the journey into JMeter I have to type in a unique 4digit id within my user journey test case Its default to 2323 at the moment in jmeter Is there a way of generating a random 4didgit number? For example thread1: ID: 2323 thread2: 3334 thread3: 5643 Please refer to images below: 回答1: Use Random JMeter function ${__Random(0000,9999)} The random function returns a random number that

问题 Is it possible to generate 'Random number' variables in JMeter? I have recorded a user journey I have imported the journey into JMeter I have to type in a unique 4digit id within my user journey test case Its default to 2323 at the moment in jmeter Is there a way of generating a random 4didgit number? For example thread1: ID: 2323 thread2: 3334 thread3: 5643 Please refer to images below: 回答1: Use Random JMeter function ${__Random(0000,9999)} The random function returns a random number that

问题 Is it possible to generate 'Random number' variables in JMeter? I have recorded a user journey I have imported the journey into JMeter I have to type in a unique 4digit id within my user journey test case Its default to 2323 at the moment in jmeter Is there a way of generating a random 4didgit number? For example thread1: ID: 2323 thread2: 3334 thread3: 5643 Please refer to images below: 回答1: Use Random JMeter function ${__Random(0000,9999)} The random function returns a random number that