大约有 5,213 项符合查询结果（耗时：0.0334秒） [XML]
Cluster analysis in R: determine the optimal number of clusters
Being a newbie in R, I'm not very sure how to choose the best number of clusters to do a k-means analysis. After plotting a subset of below data, how many clusters will be appropriate? How can I perform cluster dendro analysis?
...
When do I need to use Begin / End Blocks and the Go keyword in SQL Server?
Can someone tell me when and where I need to use begin and end blocks in SQL Server?
Also, what exactly does the Go keyword do?
...
When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
I know that the compiler will sometimes initialize memory with certain patterns such as 0xCD and 0xDD . What I want to know is when and why this happens.
...
How to create the branch from specific commit in different branch
I have made several commits in the master branch and then merged them to dev branch.
5 Answers
...
All permutations of a Windows license key
I need to apply for a Windows 8 upgrade for my laptop, for which I need the Windows 7 license key on the underside of the laptop.
...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...可连接到物联网设备的移动应用程序 [1]。
在构建 BluetoothLE 组件时，我们融合了两项主要技术：MIT App Inventor 和低功耗蓝牙 (BLE)。 本文讨论了所使用的技术方法以及实施的结果和影响。
MIT App Inventor
MIT App Inventor 具有基于块的...
What's the difference between => , ()=>, and Unit=>
I'm trying to represent a function that takes no arguments and returns no value (I'm simulating the setTimeout function in JavaScript, if you must know.)
...
best practice to generate random token for forgot password
... identifier for forgot password . I read i can do it by using timestamp with mt_rand(), but some people are saying that time stamp might not be unique every time. So i am bit of confused here. Can i do it with using time stamp with this ?
...
In the shell, what does “ 2>&1 ” mean?
In a Unix shell, if I want to combine stderr and stdout into the stdout stream for further manipulation, I can append the following on the end of my command:
...
Why use apparently meaningless do-while and if-else statements in macros?
In many C/C++ macros I'm seeing the code of the macro wrapped in what seems like a meaningless do while loop. Here are examples.
...