unique | 易学教程

How to choose a set of unique random numbers (no duplicates) using the jQuery.inArray method?

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问题 This is a Javascript / jQuery question: I'm trying to generate six unique random numbers between 1 and 21 (no duplicates), using the jQuery.inArray method. Those six numbers will then be used to select six .jpg files from a group named logo1.jpg through logo21.jpg. Can anyone tell me what I'm doing wrong here? <div id="client-logos"></div> <script src="http://code.jquery.com/jquery-1.5.js"></script> <script type="text/javascript"> Show = 6; // Number of logos to show TotalLogos = 21; // Total

Numpy unique 2D sub-array [duplicate]

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问题 This question already has answers here : Find unique rows in numpy.array (20 answers) Closed 3 years ago . I have 3D numpy array and I want only unique 2D-sub-arrays. Input: [[[ 1 2] [ 3 4]] [[ 5 6] [ 7 8]] [[ 9 10] [11 12]] [[ 5 6] [ 7 8]]] Output: [[[ 1 2] [ 3 4]] [[ 5 6] [ 7 8]] [[ 9 10] [11 12]]] I tried convert sub-arrays to string (tostring() method) and then use np.unique, but after transform to numpy array, it deleted last bytes of \x00, so I can't transform it back with np.fromstring

js数组对象的去重

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 第一种方案: var arr = [1,1,4,2,4,5,6,7]; var newArr = new Set(arr); console.log(newArr); 但是如果是对象就傻眼了。 function unique(arr){ let unique = {}; arr.forEach(function(item){ unique[JSON.stringify(item)]=item;//键名不会重复 }) arr = Object.keys(unique).map(function(u){ //Object.keys()返回对象的所有键值组成的数组，map方法是一个遍历方法，返回遍历结果组成的数组.将unique对象的键名还原成对象数组 return JSON.parse(u); }) return arr; } var a = [{a:'1',b:'2'},{a:'3',b:'4'},{a:'5',b:'6'}]; //a = a.filter(item=>item.a='sss'); //console.log(a) var b = [{a:'1',b:'2'},{a:'5',b:'6'},{a:'7',b:'8'}]; var c = [...a,...b]; console.log

why is php generating the same session ids everytime in test environment (WAMP)?

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问题 i've configured wamp in my system, and am doing the development cum testing in this local environment. i was working on the logout functionality, and happened to notice that the session ids being generated are same within the browser. Eg - chrome always generates session id = abc, for all users even after logging out and logging in; IE always generates session id = xyz, for all users. Is this an issue with wamp/ my test environment? please find below my logout php script - <?php session_start

Safe to use random numbers to make filenames unique?

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问题 I'm writing a program which basically processes data and outputs many files. There is no way it will be producing more than 10-20 files each use. I just wanted to know if using this method to generate unique filenames is a good idea? is it possible that rand will choose, lets say x and then within 10 instances, choose x again. Is using random(); a good idea? Any inputs will be appreciated! Random rand = new Random (); int randNo = rand.Next(100000,999999)l using (var write = new StreamWriter(

How to count unique elements in the array? Need only idea

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问题 For example: String[] str = {"M1","M1","M1","M2","M3"}; The most recommended is the answer - HashSet . Which methods or you have better idea? 回答1: Unless you want to implement this yourself, a Set is the way to go. A set will only allow unique elements to be added and will automatically filter duplicates. The HashSet functionality works as follows: The hash is computed for the object. Next the set checks if any of the objects with the same hash-value .equals() the new value. If so, the new

PHP MySQL consolidate column where other column has duplicates

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问题 I have a MySQL table that has three columns, the first is a unique key ( INT(11) AUTO_INCREMENT ), the next is an indexed value ( VARCHAR(255) ) and the third is a description ( TEXT ). There are duplicate values in the second column, but each row has a different description. I want to remove all rows where the second column is duplicated but append each description of the same indexed value to the first instance the value, and breaking string with a semicolon and space. For example, my table

How to generate unique random numbers in an array

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问题 I'm having trouble with this assignment that requires me to create 50 random unique numbers without using ArrayLists. I'm required to use a boolean array that checks whether the random number has already been generated. Each number that is generated out of 50 will be set to true in the boolean array. Ex. Generating a number 23 would make check[23]=true. The problem I am having is an error in the while loop that keeps on generating a new random number even if there is no other unique number

How to generate unique random numbers in an array

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MS Excel macro deleting duplicate rows and sum their values

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问题 I'm very briefly familiar with vba and I cannot work out how to amend the following script to make it do what I expect. Basically I have 5 column excel. Column A are the values I would like to sum, providing that B and C and D and E are unique as a row. I found the following script, which does nearly what I need: Option Explicit Sub RedoDataset() Dim LastCol As Long Dim LastRowData As Long Dim LastRow As Long Dim Ctr As Long Dim CompanyArr Dim RowFoundArr Dim SumArr Dim Rng As Range Dim