大约有 40,000 项符合查询结果（耗时：0.0631秒） [XML]
Set default CRAN mirror permanent in R
...a CRAN mirror
# local({r <- getOption("repos")
# r["CRAN"] <- "http://my.local.cran"
# options(repos=r)})
So remove the comment marks and change "http://my.local.cran" to the correct website, e.g.:
local({r <- getOption("repos")
r["CRAN"] <- "http://cran.r-project.o...
In log4j, does checking isDebugEnabled before logging improve performance?
...ava 8, you don't have to use isDebugEnabled() to improve the performance.
https://logging.apache.org/log4j/2.0/manual/api.html#Java_8_lambda_support_for_lazy_logging
import java.util.logging.Logger;
...
Logger.getLogger("hello").info(() -> "Hello " + name);
...
Boost Statechart vs. Meta State Machine
...th information on the performance/scalability tradeoffs can be found here:
http://www.boost.org/doc/libs/1_45_0/libs/statechart/doc/performance.html
share
|
improve this answer
|
...
How to drop column with constraint?
...ser defined function or view with SCHEMABINDING option set for them.
UPD:
Completely automated dropping of constraints script:
DECLARE @sql NVARCHAR(MAX)
WHILE 1=1
BEGIN
SELECT TOP 1 @sql = N'alter table tbloffers drop constraint ['+dc.NAME+N']'
from sys.default_constraints dc
JOIN sys...
is there a require for json in node.js
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Making 'git log' ignore changes for certain paths
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Get local IP address in node.js
...
https://github.com/indutny/node-ip
var ip = require("ip");
console.dir ( ip.address() );
share
|
improve this answer
...
Gradle, “sourceCompatibility” vs “targetCompatibility”?
...o run it e.g. on other workstation with older java version.
According to: https://docs.oracle.com/en/java/javase/11/tools/javac.html
share
|
improve this answer
|
follow
...
Javascript - removing undefined fields from an object [duplicate]
...defined) {
delete obj[prop];
}
}
}
Working demo: http://jsfiddle.net/jfriend00/djj5g5fu/
share
|
improve this answer
|
follow
|
...
Difference between socket and websocket?
... from browsers connecting to Application Server over a protocol similar to HTTP that runs over TCP/IP. So they are primarily for Web Applications that require a permanent connection to its server. On the other hand, plain sockets are more powerful and generic. They run over TCP/IP but they are not r...