unique

问题 I'm pretty new to go and I'm really, really confused right now. Let's say I have a list of coordinates and lets say I have some doubles in this list of coordinates. I can't for the life of me figure out how to make a unique list. Normally in Python I can "cheat" with sets and other built-ins. Not so much in Go. package main import ( "fmt" "reflect" ) type visit struct { x, y int } func main() { var visited []visit var unique []visit visited = append(visited, visit{1, 100}) visited = append

问题 I have a data frame of plant plantsp and herbivore lepsp species and their interactions int1 and int2 with sampling nested in site , season and group . I wish to create a loop that makes pairwise comparisons among each level of group collected within each site and season subset. Fore each pairwise comparison I will calculate total MATCHING and UNIQUE interactions among int1 and int2 . I have devised the following steps to break down this problem: Consider the following example data frame df :

问题 I have a data frame of plant plantsp and herbivore lepsp species and their interactions int1 and int2 with sampling nested in site , season and group . I wish to create a loop that makes pairwise comparisons among each level of group collected within each site and season subset. Fore each pairwise comparison I will calculate total MATCHING and UNIQUE interactions among int1 and int2 . I have devised the following steps to break down this problem: Consider the following example data frame df :

问题 I have an Artist model that has many Album s in a HABTM association. Though I would like to permit two different albums to have the same name I'd like to ensure that there aren't two in the collection of one artist. So far example: artist_1 = Artist.create(name: "Jay-Z") artist_2 = Artist.create(name: "The Beatles") album_1 = Album.create(name: "The Black Album", artist_ids: [1]) album_2 = Album.create(name: "The Black Album", artist_ids: [1]) => Should return error album_2 = Album.create

问题 I have an XML file that stores movies and their actors. <?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/xsl" href="index.xsl"?> <movies xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="movies.xsd"> <movie movieID="1"> <actors> <actor actorID="1"> <name link="hello">Bob</name> </actor> <actor actorID="2"> <name link="hello">Mike</name> </actor> </actors> </movie> <movie movieID="2"> <actors> <actor actorID="1"> <name link="hello">Bob</name

问题 I want to remove the values from array which are same. For example: This is the array. Array ( [0] => 1 [1] => 63 [2] => 1 ) is there any function or something in core php which return me only the value which is not duplicate i.e value with index number 1 and delete index 0 and 2 , I want the result Array ( [1] => 63) Is there any way? 回答1: You can use array_filter() and array_count_values() to check the count is not greater then 1. <?php $data = [1, 63, 1]; $data = array_filter($data,

问题 I am new to unix and would like to be able to do the following but am unsure how. Take a text file with lines like: TR=P567;dir=o;day=su;TI=12:10;stn=westborough;Line=worcester TR=P567;dir=o;day=su;TI=12:10;stn=westborough;Line=lowell TR=P567;dir=o;day=su;TI=12:10;stn=westborough;Line=worcester TR=P234;dir=o;day=su;TI=12:10;stn=westborough;Line=lowell TR=P234;dir=o;day=su;TI=12:10;stn=westborough;Line=lowell TR=P234;dir=o;day=su;TI=12:10;stn=westborough;Line=worcester And output this: TR=P567

问题 The Problem I need an algorithm that does this: Find all the unique ways to partition a given sum across 'buckets' not caring about order I hope I was clear reasonably coherent in expressing myself. Example For the sum 5 and 3 buckets, what the algorithm should return is: [5, 0, 0] [4, 1, 0] [3, 2, 0] [3, 1, 1] [2, 2, 1] Disclaimer I'm sorry if this question might be a dupe, but I don't know exactly what these sort of problems are called. Still, I searched on Google and SO using all wordings

问题 I have a couple of columns (ip, provider_id) for which I want combinations of values to always be unique. Therefore, I am trying to build a custom validation function. But I am having issues grabbing on the value of the secondary field. This is my code so far in the model: public $validate = array( 'ip' => array( 'rule' => array('uniqueClick', 'provider_id'), 'message' => 'The click is not unique.' ) ); public function uniqueClick ($ip, $field) { $count = $this->find('count', array(

问题 I have an array a as follows: a = [ 1 2; 3 4; 1 2 ]; I want to delete all rows appearing more than once in a and get c : c = [ 3 4 ]; Please note that this is not the same operation as keeping unique rows, since I don't want rows that had duplicates to appear at all. How can I accomplish this? 回答1: The third output of unique gives you the index of the unique row in the original array. You can use this with accumarray to count the number of occurrences, which can be used to select rows that