compare | 易学教程

Why does Collections.max() not return actual max value for a Collection of String?

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问题 ArrayList<String> dirNo = new ArrayList<String>(); dirNo.add("1"); dirNo.add("2"); dirNo.add("3"); dirNo.add("4"); dirNo.add("5"); dirNo.add("6"); dirNo.add("7"); dirNo.add("8"); dirNo.add("9"); dirNo.add("10"); dirNo.add("11"); System.out.println("max : " + Integer.parseInt(Collections.max(dirNo))); After executing above code, print 9 as output. But actually max value should be 11 . Why am I getting 9 as max ? 回答1: Since your elements are strings, Collections.max() is returning the value

What tool to use to compare and reduce css style sheets

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问题 I have a page (page1.html) which references a css file (style1.css) All is good. I need Page1.html to additionally reference Style2.css However when I add the reference, some stuff on Page1.html screws up. How can I determine what it is about Style2.css that is causing this problem? Some diff Tool? Some Process? 回答1: Firebug shows you which rules are being overridden, and from which stylesheet the rules come from. Just select the problem elements and it will show you the rules applied to it.

Diff between commits in Visual Studio 2015 using git

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问题 Using Visual Studio 2015 Update 2 and git as source control, how do you diff between 2 commits on a branch? Note that I am not talking about diff on the granular file level (ie. view history of file and comparing), but rather for entire commits. I would expect to be able to compare when looking at the history of a branch, but the option does not exist. Here's the right click menu I see when I right click on a commit when viewing the history of a branch: Where's the compare?? 回答1: While not

Using SIFT descriptors to compare similarity between two images

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问题 I'm using the SIFT algorithm to determine the level of similarity between two images. I managed to get the list of descriptors for image but I cant seem to figure what to do next. My problem is that I have a different number of descriptors and their order is maybe not the same. What is the best way to compare these descriptors? Thanks. 回答1: Basic euclidean distance together with a heuristic that stipulated that a match is only accepted if it is significantly better than the second best match.

How to do XML canonical comparison with PostgreSQL?

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I need to compare XML values with PostgreSQL 9.X. Example: SELECT 1 FROM t WHERE xml1=xml2; -- error for XML datatype but can do only with casting to text datatype, SELECT 1 FROM t WHERE xml1::text=xml2::text; -- OK, but is a text-comparison that is not the best way to do this. I need a better comparison algorithm... Looking for it, I find that, perhaps, "Canonical XML" can be compared. How to do "Canonical XML comparison" with PostgreSQL? NOTE : PostgreSQL team assumes false premisse about XML comparison? Many documents about XML comparison sugest that Canonical XML is the reference format

Comparing multiple data frames

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问题 I need some help with data analysis. I do have two datasets (before & after) and I want to see how big the difference is between them. Before 11330 STAT1 2721 STAT2 52438 STAT3 6124 SUZY After 17401 STAT1 3462 STAT2 0 STAT3 72 SUZY Tried to group them with tapply(before$V1, before$V2, FUN=mean) . But as I am trying to plot it, on x axis am not getting the group name but number instead. How can I plot such tapplied data (frequency on Y axis & group name on X axis)? Also wanted to ask what is

如何在文本对比工具合并文本时设置对齐方式

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Beyond Compare是一款好用的文本合并工具，软件自设合并浏览器支持将一个文件或文件夹的两个不同版本进行变更合并，生成一个输出。其中颜色编码和部分高亮显示允许您简单、快速地接受、拒绝以及合并变更。使用 Beyond Compare 进行文本合并时，也有许多操作技巧，可以帮助您高效并且准确的完成合并工作，接下来就和大家讲解一下，文本合并设置对齐方式的技巧。具体操作步骤如下所示步骤一：打开Beyond Compare软件，在主页面选择文本合并会话，打开会话操作界面。单击合并会话界面左右两侧“打开文件”按钮，选择您需要合并的文本文件。步骤二：将光标停留在左侧或者右侧窗格您需要对齐的一侧文本行内，单击菜单栏“编辑”按钮，在展开的菜单选择“对齐方式”命令。 Beyond Compare文本合并编辑菜单图例步骤三：现假设将光标放在左侧窗格的第6行，需要与右侧窗格的第13行进行文本对齐操作。首先执行“对齐方式”命令，随即文本合并会话界面发生变化，如下图图例所示。 Beyond Compare文本合并编辑菜单图例步骤四：在文本合并会话界面中，用带有问号图标的鼠标箭头直接点击右侧窗格的第13行，即可完成强制文本对齐的设置，操作结果界面如下图所示。 Beyond Compare文本合并设置对齐方式后界面图例上述内容详细讲解，使用Beyond

Compare every 2 rows and show mismatches in R

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问题 I have searched a lot and tried on my own too, but couldn't find solution for this particular problem. For every 2 rows ('key' is common), I have to find mismatches in every column and highlight them in an organized way like below. The output should be in the following format: COLUMN_NAME is not matching for records below: PRINT COMPLETE RECORDS ... COLUMN_NAME is not matching for records below: PRINT COMPLETE RECORDS ... COLUMN_NAME is not matching for records below: PRINT COMPLETE RECORDS .

How to compare two array values in PHP

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i have two functions, the first one is: public function computeGHComponents() { error_reporting (E_ALL^ E_NOTICE); $totals = NULL; foreach ($this->transaction as $t){ $amount = (float) $t['Amount']; if (isset($totals[ $t['SiteID'] ][ $t['TransactionType'] ])){ $totals[ $t['SiteID'] ][ $t['TransactionType'] ] += (float) $amount; } else { $totals[ $t['SiteID'] ][ $t['TransactionType'] ] = (float) $amount; } } foreach($totals as $key => $value) { $this->result[$key]['Deposit'] = isset($value['D']) ? $value['D'] : 0; $this->result[$key]['Reload'] = isset($value['R']) ? $value['R'] : 0; $this-

set constructor with custom compare function

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问题 How is the y.size() = 4 in the following? The values in y are {11, 2, 4, 7} How does one arrive at this? What are a and b in the operator() function for each iteration of the set. I don't understand the construction of y and I can't find anything online that explains this situation. Thank You #include <iostream> #include <set> struct C { bool operator()(const int &a, const int &b) const { return a % 10 < b % 10; } }; int main() { std::set<int> x({ 4, 2, 7, 11, 12, 14, 17, 2 }); std::cout << x