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How to select a CRAN mirror in R
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You should either get a window with a list of repositories or a text menu with some options. But if that is not appearing, you can always specify the mirror from where to download the packages yourself by using repos parameter. By doing that, R will not ask you anymore abou...
Difference between core and processor
...on order, and performing the operations through ALUs. For optimization purposes, a core can also hold on-core caches with copies of frequently used memory chunks.
A CPU may have one or more cores to perform tasks at a given time. These tasks are usually software processes and threads that the OS s...
How to convert An NSInteger to an int?
...ore than a 32/64 bit int. (it will use the appropriate size based on what OS/platform you're running)
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process.env.NODE_ENV is undefined
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To set an environment variable in Windows:
SET NODE_ENV=development
on OS X or Linux:
export NODE_ENV=development
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How to read a (static) file from inside a Python package?
...oesn't work in all situations. please refer to the other answers]
import os, mypackage
template = os.path.join(mypackage.__path__[0], 'templates', 'temp_file')
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Is it OK to leave a channel open?
Is it OK to leave a Go channel open forever (never close the channel) if I never check for its state? Will it lead to memory leaks? Is the following code OK?
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An operation on a socket could not be performed because the system lac...
...是 5000"适用于"一节中包含的产品中。在这些产品中添加一个新参数。若要增加的最大临时端口数，请执行以下步骤：
启动注册表编辑器。
在注册表中，找到以下注册表子项，然后单击参数：
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSe...
解决：apache2.service: Failed to run \'start\' task: No such file or d...
...-to-run-start-task-no-such-file-or-directory今天重启apache2时，出现一个错误：apache2 service: Failed to run & 39;start& 39; task: No such file or directory。原因是：& 39; var tmp& 39;目录被删掉了导致的。mkdir var tmp 搞定。今天 systemctl reload apache2.service 重...
解决Scrapy警告:You do not have a working installation of the service_i...
...操作时，出现如下错误：从提示错误来看，我们需要安装一个模块service_identity，根据提示地址（https: pypi python org pypi service_identity）来安装 使用scrapy进行爬虫项目的操作时，出现如下错误：
从提示错误来看，我们需要安装...
An operation on a socket could not be performed because the system lac...
...是 5000"适用于"一节中包含的产品中。在这些产品中添加一个新参数。若要增加的最大临时端口数，请执行以下步骤：
启动注册表编辑器。
在注册表中，找到以下注册表子项，然后单击参数：
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSe...