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Creating an R dataframe row-by-row
... I came up with is the suggestion to create an empty list, keep a list index scalar, then each time add to the list a single-row dataframe and advance the list index by one. Finally, do.call(rbind,) on the list.
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Get screen width and height in Android
...tDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;
In a view you need to do something like this:
((Activity) getContext()).getWindowManager()
.getDefaultDisplay()
.getMetrics...
adito-gateway -华为云免费SSL VPN解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，出现如下界面。貌似我的密码设置长了点。
点击 exit 退出安装界面。
退出之前 终端上是这个界面
退出之后是如下界面，回到提示符
先别忙着重启服务器，我们现在可以替换到centos自带的openJDKl 不然客户...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
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Using App Inventor extensions to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the ...
Redirecting from HTTP to HTTPS with PHP
...s entering his billing details and maintain the HTTPS connection for the next pages until he logs out.
5 Answers
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What does multicore assembly language look like?
Once upon a time, to write x86 assembler, for example, you would have instructions stating "load the EDX register with the value 5", "increment the EDX" register, etc.
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When is a CDATA section necessary within a script tag?
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A CDATA section is required if you need your document to parse as XML (e.g. when an XHTML page is interpreted as XML) and you want to be able to write literal i<10 and a && b instead of i&lt;10 and a &amp;&amp; b, as XHTML will parse the JavaScript code as parsed char...
super() fails with error: TypeError “argument 1 must be type, not classobj” when parent does not inh
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print type(NewStyle) # prints <type 'type'>
Note that in Python 3.x, all classes are new-style. You can still use the syntax from the old-style classes but you get a new-style class. So, in Python 3.x you won't have this problem.
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postgresql COUNT(DISTINCT …) very slow
...DISTINCT()) performs sorting, it will be definitely helpful to have an index on the column_name especially with relatively small amount of work_mem (where hashing will produce relatevely large amount of batches). Since that, it's not always bad to use COUNT (DISTINCT()_, isn't?
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Anaconda vs. EPD Enthought vs. manual installation of Python [closed]
...ckages, and even more if you use any of the Enthought packages (Chaco for example is very useful for realtime data visualization), then EPD/Canopy is probably a better choice. The Academic version has a larger number of packages in the base install, and many more in the repository. Anaconda also inc...