random

问题 I am using Flexslider - http://www.woothemes.com/flexslider/ and I have a slider setup with 37 slides in it (yes I know this is ridiculous). I need a way where when the page loads, it randomly picks a slide between slide 1 and slide 37, and then it continues on squentially from there. For example: The page loads and it randomly picks slide # 17. The next slide to appear after slide 17 should be 18, then 19, then 20 and so on. The next time the page loads it randomly picks another slide. Say

问题 I'm trying to get a random contact from a phone's contact list, but without noticeably slowing down the phone. That means that I can't just grab all the contacts and stick them into an array and pick a random one from that array. I'd like to be able to get a random contact without having to get all of the contacts first. Is this possible, and if so, how would I go about doing it? 回答1: Updated to use non-deprecated code. Query based on this answer: How to read contacts on Android 2.0 Cursor

问题 I have been reading up about the random.sample() function in the random module and have not seen anything that solves my problem. I know that using random.sample(range(1,100),5) would give me 5 unique samples from the 'population'... I would like to get a random number in range(0,999) . I could use random.sample(range(0,999),1) but why then am I thinking about using random.sample() ? I need the random number in that range to not match any number in a separate array (Say, [443,122,738] ) Is

问题 I have a median and a standard deviation, what i want is to generate random numbers between the median-std and the median+std. I know how to do it like this: import numpy as np import random as rnd median=30 std=15 random_nr=rnd.randint(median-std,median+std) I also found the numpy.random.normal function but it doesn't seem to do what i need. Is there any other way of doing it? It would be great if the random generator would generate numbers in mirror as to the median, for example, an output

问题 I am referring to the function in the answer on PHP random string generator (I have removed the default $length param). So this code uses that function but for some reason if you run this code you will see that the strings appear multiple times in the array! So how if this is truly random can I produce these results? Do I need to amend something to produce really random strings? function generateRandomString($length) { $characters =

问题 I have a column that I would like to default to a randomly generated int8 in a specified range. I would also like this column to be unique, so if a random value is generated that already exists, it should be rerolled. So my question is what the most idiomatic way to do the above is in PostgreSQL, ideally with good performance and supporting bulk inserts. For example if I had a Person table with columns name and id , and I want id to be a random unique int8 in the range (0, 999999) . I would

问题 I have a video chat requirement wherein I have to connect 2 (somewhat related) users through video chat. I am not finding necessary api to call, hence the question. I am basically following this tutorial but it seems it doesn't have everything I need. I do not need explicit "call to this user" sort of function. The user never gets to see entire user list. As a result, I wonder if I could have X number of users calling and another X number of users waiting to accept that call. To summarize: I

问题 I have a video chat requirement wherein I have to connect 2 (somewhat related) users through video chat. I am not finding necessary api to call, hence the question. I am basically following this tutorial but it seems it doesn't have everything I need. I do not need explicit "call to this user" sort of function. The user never gets to see entire user list. As a result, I wonder if I could have X number of users calling and another X number of users waiting to accept that call. To summarize: I

问题 When I try to generate a new random number using Math.random() it gives me the EXACT same answer every single time no matter what, but only in certain uses. By the way I have a custom random function: function random(min, max) { return Math.random() * (max - min + 1) + min; } For example, this code does exactly what I want it to, it fills each slot in dataset.data[I][ii] to a NEW random number. dataset.data.forEach((point, index) => { //fill dataset with random numbers dataset.data[index] =

问题 I'm trying to provide an interface — through a config file — for my users to choose a distribution for some of the parameters that they are using. I would like to use STL random number generator algorithms for this purpose. Let's assume that my program reads a JSON from a command line. For the JSON provided below, the program needs to realize that it should generate a random number from the normal distribution with given mean and standard variation. (I'm using the same parameter names as STL