compare | 易学教程

compare two arrays Laravel

阅读更多关于 compare two arrays Laravel

问题 I have articles that can contain different tags. For example, 5 pieces: (php, html, css, laravel, js) And I have groups that can also contain different tags. For example 4 pieces: (laravel, php, html, css) I have already defined the relationships and it works. What I still lack is the linkage of article to the group. In the Articlecontroller i use this so sync: $article->groups()->sync($group->id); Article Model public function groups() { return $this->belongsToMany('App\Group'); } public

Compare_DF in R truncating trailing zero

阅读更多关于 Compare_DF in R truncating trailing zero

问题 I have two dataframes: df1 score id 59.09 1 65.27 2 65.05 3 60.15 4 65.30 5 65.61 6 59.21 7 59.70 8 And the other dataframe df2 score id 59.10 1 65.27 2 65.05 3 60.15 4 65.30 5 65.62 6 59.21 7 59.70 8 Now when I use compare_df and output it dropped the trailing 0 in df2 score` 59.10. I need this trailing zero to be always displayed. I have a contraint to use compareDF only. 来源： https://stackoverflow.com/questions/54880218/compare-df-in-r-truncating-trailing-zero

Regex for number comparison?

阅读更多关于 Regex for number comparison?

问题 I would like to perform regex to return true/false if the input 5 digit from input matching data in database, no need to cater of the sequence, but need the exact numbers. Eg: In database I have 12345 When I key in a 5 digit value into search, I want to find out whether it is matching the each number inside the 12345. If I key in 34152- it should return true If I key in 14325- it should return true If I key in 65432- it should return false If I key in 11234- it should return false Eg: In

how to recursively compare 2 lists in python (unsorted, order-independent)

阅读更多关于 how to recursively compare 2 lists in python (unsorted, order-independent)

问题 The last issue I have is being able to accurately compare two lists of the same size that have no elements in common. I cannot use any built in Python functions (i.e., sort, compare, Counter) except for list methods len, del, index. My code: def SameStuff(l1, l2): if len(l1) <= 1 or len(l2) <= 1 or len(l1) != len(l2): if len(l1) == 0 or len(l2) == 0: return len(l1) == len(l2) else: return len(l1) == len(l2) and l1[0] == l2[0] else: if l1[0] == l2[0]: return SameStuff(l1[1:], l2[1:]) else:

Comparing values in Array fails

阅读更多关于 Comparing values in Array fails

问题 Sometimes comparing two strings within arrays fails. Failing occurs occasionally only in looped if s. Example code below stands for implementing the problem. searchTable.sort(); for(n=1;n<searchTable.length;n++){ // alert(searchTable[n-1]!=searchTable[n]); if(searchTable[n-1]!=searchTable[n]){ idx++; memTable[idx]=searchTable[n]; } } Values in the searchTable are strings for sure, and all values are not similar either. In loop, all values are set in memTable[idx], despite of the similar

好程序员大数据教程分享实用的大数据之数组

阅读更多关于好程序员大数据教程分享实用的大数据之数组

好程序员大数据教程分享实用的大数据之数组 1.5.1 数组的定义与元素访问数组是一个容器, 是一个用来存储指定数据类型的容器注意事项: 数组是一个定长的容器, 一旦实例化完成, 长度不能修改名词解释: 数组长度: 指的就是这个容器的容量, 表示这个数组中能存储多少个数据元素: 指的就是数组中存储的数据下标: 某一个元素在数组中的一个位置索引遍历数组: 依次获取到数组中的每一个元素数组的元素访问通过下标来访问的, 数组中元素的下标是从0开始的数组中元素的下标: [0, 数组.length - 1] 注意: 在访问数组中元素的时候, 注意下标的范围, 不要越界!!! 遍历数组: 使用循环遍历下标的方式 int[] array = {1, 2, 3}; for (int index = 0; index < array.length; index++) { System.out.println(array[index]); } 使用增强for循环 int[] array = {1, 2, 3}; for (int ele : array) { System.out.println(ele); } 1.5.2 数组的内存分析 1.5.3 数组的常见操作 1.5.4 数组排序选择排序固定一个下标, 然后用这个下标对应的元素依次和后面每一个下标的元素进行比较 int[]

Why does Prolog does not backtrack on comparison?

阅读更多关于 Why does Prolog does not backtrack on comparison?

问题 I would expect that the following should always be true if a comparison backtrack, right? unless it goes into an infinite loop! ?- Y=2 , random:random(1,3,X), X =\= Y. Y = 2, X = 1. ?- Y=2 , random:random(1,3,X), X =\= Y. false. but I got false! In general, my question is why doesn't comparison backtrack? Thanks for all the answers. My confusion seemed to come primarily from my expectation of random keep generating new-random numbers, so I confused that comparison was not backtracking,

Sql Server Compare Application

阅读更多关于 Sql Server Compare Application

问题 I want to know is what is the best sql server comparison tool application on the market? I recently noticed an app which I loved and posted a question about BUT with a link to the website. Bad mistake, was naive. I do a lot of programming and database development at home and have been using Red Gate (licence supplied by work while I work at h0me) but as I am leaving in 2 weeks time, I am desperate for a replacement BUT cheap replacement. I apologise for recent posting where I typed in the url

Comparing string date with today's date

阅读更多关于 Comparing string date with today's date

问题 So I have a string which is "2014-06-30 15:27" and if it is today's date it should only return "15:27" else "30/06/2014". I've already tried simpleDateFormat.parse but it didn't work very well. holder.data.setText(mensagem.getDate()); 回答1: final String stringDate = "2014-07-17 23:59"; SimpleDateFormat inputFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm"); Date date = inputFormat.parse(stringDate); Calendar calendarDate = Calendar.getInstance(); calendarDate.setTime(date); Calendar midnight =

C++ comparing a char to a string literal [duplicate]

阅读更多关于 C++ comparing a char to a string literal [duplicate]

问题 This question already has answers here : c++ compile error: ISO C++ forbids comparison between pointer and integer (5 answers) Closed 2 years ago . Beginning programmer here... I'm writing a very simply program for my computer science class and I ran into an issue that I'd like to know more about. Here is my code: #include <iostream> using namespace std; int main(int argc, const char * argv[]) { char courseLevel; cout << "Will you be taking graduate or undergraduate level courses (enter 'U'"