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r - Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2

I have the following 2 data.frames: a1 <- data.frame(a = 1:5, b=letters[1:5]) a2 <- data.frame(a = 1:3, b= ... .a2.rows) } rows.in.a1.that.are.not.in.a2(a1,a2) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Inconsistent Accessibility: Parameter type is less accessible than method

I'm trying to pass an object (a reference to the currently logged on user, basically) between two forms. At the ... , which isn't the case here. Anybody help? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Android: Retrieving shared preferences of other application

I have a settings application from which i have to retrieve other applications preferences, but i don't have ... and values in that preference? Thanks, Swathi Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - How to escape hash character in URL

How to escape the # hash sign (sometimes known as number sign or pound sign) sent in the query string of a URL? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - PHP_SELF and XSS

I've found an article claiming that $_SERVER['PHP_SELF'] is vulnerable to XSS. I'm not sure if I have understood it ... ">  </form> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to groupby consecutive values in pandas DataFrame

I have a column in a DataFrame with values: [1, 1, -1, 1, -1, -1] How can I group them like this? [1,1] [-1] [1] [-1, -1] Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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language agnostic - Getting N random numbers whose sum is M

I want to get N random numbers whose sum is a value. For example, let's suppose I want 5 random numbers that ... of a matrix of belongings for Fuzzy C-means. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Scale the ImageIcon automatically to label size

On my JFrame, I am using the following code to display an image on the Panel : ImageIcon img= new ImageIcon(" ... and then to autosize the image in the label? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Cannot open include file: 'io.h': No such file or directory

I was trying to compile a simple .pyx file using Cython. print("hello") Here's my setup.py: from distutils ... 3.5, and Visual Studio Express 2015 installed. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - difference between two arrays

I have following two arrays. I want the difference between these two arrays. That is, how can I find the values that do not ... 108 [21] => 110 [22] => 112); Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - How to center elements on the last row in CSS Grid?

I am using CSS grid to layout some items like this... #container { display: grid; grid-template-columns: 16.666% 16. ... <div class="item">Item</div> </div> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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subprocess - Stop reading process output in Python without hang?

I have a Python program for Linux almost looks like this one : import os import time process = os.popen("top"). ... Any I idea guys, I'm really stuck now ? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Passing data between forms

I have two forms. First, Form1 has a group box, some labels and a listbox. I press a button and new Form2 is ... to its Text property but it failed. Any ideas? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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NoSuchElementException with Java.Util.Scanner

I am very new to Java but am working through the book Java: How to program (9th ed.) and have reached an ... than this in terms of deducing what the problem is. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Function with forEach returns undefined even with return statement

I'm just making a function for checking a value of something in my object array, but for some reason it keeps ... getByKey('1111-1111-1111'); console.log(asd); Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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asp.net mvc - Why does the DropDownListFor lose the multiple selection after Submit but the ListBoxFor doesn't?

I have read many articles about using MultiSelectList and have yet to understand what is going wrong with my DropDownListFor ... multiple = "multiple" }) </div> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Pointer to pointer of structs indexing out of bounds(?) when I try to index anything other than zero

I'm trying to edit an array (as a pointer) of structs by filling in the default values with new structs that I ... nearCount; l->isValid = 1; return l; } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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293 views

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git rm - How can I delete a file from a Git repository?

I have added a file named "file1.txt" to a Git repository. After that, I committed it, added a couple of ... .txt" without affecting others, like dir1 and dir2? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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compilation - What does a just-in-time (JIT) compiler do?

What does a JIT compiler specifically do as opposed to a non-JIT compiler? Can someone give a succinct and easy to understand description? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - How do I check if a string contains another string in Objective-C?

How can I check if a string (NSString) contains another smaller string? I was hoping for something like: ... to find if a string contains another string? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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76 views

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android - Restful API service

I'm looking to make a service which I can use to make calls to a web-based REST API. Basically I want to ... break; default: super.handleMessage(msg); } } }; Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to define hash tables in Bash?

What is the equivalent of Python dictionaries but in Bash (should work across OS X and Linux). Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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381 views

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strong typing - Is Python strongly typed?

I've come across links that say Python is a strongly typed language. However, I thought in strongly typed ... is Python a strongly or weakly typed language? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Comparing date ranges

In MySQL, If I have a list of date ranges (range-start and range-end). e.g. 10/06/1983 to 14/06/1983 15/07/ ... IN LIST 14/07/1983 to 14/07/1983 = NOT IN LIST Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jquery - Twitter bootstrap remote modal shows same content every time

I am using Twitter bootstrap, I have specified a modal <div class="modal hide" id="modal-item"> <div class ... enough and I guess I am just complicating things. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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239 views

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multithreading - How many threads is too many?

I am writing a server, and I send each action of into a separate thread when the request is received. I do ... hit that ceiling? What exactly should I measure? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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279 views

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c - Stack smashing detected

I am executing my a.out file. After execution the program runs for some time then exits with the message: **** ... reasons for this and how do I rectify it? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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125 views

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How to get Linux console window width in Python

Is there a way in python to programmatically determine the width of the console? I mean the number of characters ... Looking for a solution that works on Linux Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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