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Changing column names of a data frame
...e called). The lesson here is, "don't write your code in an 'editor' that converts quotes to smart-quotes".
names(newprice)[1]<-paste(“premium”) # error
names(newprice)[1]<-paste("premium") # works
Also, you don't need paste("premium") (the call to paste is redundant) and it's a good...
How to add line breaks to an HTML textarea?
...the text into the textarea and then add some JavaScript behind a button to convert the invisible characters to something readable and dump the result to a DIV. That will tell you what your browser wants.
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Places where JavaBeans are used?
What is a JavaBean and why do I need it? Since I can create all apps with the class and interface structure? Why do I need beans? And can you give me some examples where beans are essential instead of classes and interfaces?
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ATL正则表达式库使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...典型使用方法：
#include "stdafx.h"
#include <atlrx.h>
int main(int argc, char* argv[])
{
CAtlRegExp<> reUrl;
// five match groups: scheme, authority, path, query, fragment
REParseError status = reUrl.Parse(
"({[^:/?#]+}:)?(//{[^/?#]*})?{[^?#]*}(?{[^#]*})?(...
javascript check for not null
...lsey". The double-not operator !! will remove more than just null. It will convert NaN and undefined into false as well. And that's why your array filters correctly when using the double not-operator !!.
– tfmontague
Aug 6 '16 at 20:50
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What are .dex files in Android?
... files. But after .class files are generated, the “dx” tool is used to convert all .class files into a single .dex, or Dalvik Executable, file. It is the .dex file that is executed on the Dalvik VM. The .dex file has been optimized for memory usage and the design is primarily driven by sharing o...
What does |= (ior) do in Python?
.... See examples below.
Sets
For example, the union of two assigned sets s1 and s2 share the following equivalent expressions:
>>> s1 = s1 | s12 # 1
>>> s1 |= s2 # 2
>>> s1.__ior__(s2) ...
What is referential transparency?
...branch of philosophy that analyzes natural language constructs, statements and arguments based on the methods of logic and mathematics. In other words, it is the closest subject outside computer science to what we call programming language semantics. The philosopher Willard Quine was responsible fo...
Multiple HttpPost method in Web API controller
...fine the following routes in WebApiConfig file.
// Controller Only
// To handle routes like `/api/VTRouting`
config.Routes.MapHttpRoute(
name: "ControllerOnly",
routeTemplate: "api/{controller}"
);
// Controller with ID
// To handle routes like `/api/VTRouting/1`
config.Rou...
How are booleans formatted in Strings in Python?
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What's the major difference between %r and %s?
– Alston
Sep 13 '15 at 8:17
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