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How do you get the magnitude of a vector in Numpy?
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"Should be a property of an array: x.norm()" I totally agree. Usually when working with numpy I use my own Array and Matrix subclasses that have all functions I commonly use pulled in as methods. Matrix.randn([5,5])
– mdaoust
Feb 7 '12...
What's the equivalent of use-commit-times for git?
...ion of "wrong" you are talking about.
It's WRONG.
It's STUPID.
And it's totally INFEASIBLE to implement.
(Note: small improvement: after a checkout, timestamps of up-to-date files are no longer modified (Git 2.2.2+, January 2015): "git checkout - how can I maintain timestamps when switching branch...
【可动态编辑表格】App Inventor 2 Dynamic Editable HTML Table - App应用...
olor=rgba(0, 0, 0, 0.54)This example will allow you to:
Display an AI2 (in csv format e.g. header row, then data rows) list in an html table. It will also allow you (with the exception of the header row) to create new rows, edit any row, and delete any row, whilst returning the saved/upd...
How to allow to accept only image files?
...t is very sketchy on mobiles (as of 2015) and by some reports this may actually prevent some mobile browsers from uploading anything at all, so be sure to test your target platforms well.
For detailed browser support, see http://caniuse.com/#feat=input-file-accept
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为AppInventor2开发自己的拓展(Extension) - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...cmd 命令行输入ant命令出现以上结果证明配置成功。
源码下载https://github.com/mit-cml/appinventor-sources国内下载非常非常缓慢，这个项目比较大，也许2天都下载不完，不过没关系，我们早已提供已下载好的工程源码，关注页面顶部公...
CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...兴趣的可以试用一下。
准备活动：
（1）安装cmake。
下载地址：http://www.cmake.org/cmake/resources/software.html
根据自己的需要下载相应的包即可，Windows下可以下载zip压缩的绿色版本，还可以下载源代码。
（2）运行cmake的方法。...
mac如何远程连接windows系统？类似Windows的mstsc？ - 开源 & Github - 清...
...fice for Mac 2011 组件之一，微软官方网站上提供单独的免费下载，它可以让你Mac设备用...Remote Desktop Connection for mac 是 Office for Mac 2011 组件之一，微软官方网站上提供单独的免费下载，它可以让你Mac设备用户远程控制Windows桌面。同...
PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
PHP操作MongoDB时的整数问题及对策本文所说的整数问题，其实并不是MongoDB的问题，而是PHP驱动的问题：MongoDB本身有两种整数类型，分别是：32位整数和64位整数，但旧版的PHP...本文所说的整数问题，其实并不是MongoDB的问题，而是P...
mongodb最大连接数配置修改 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...数mongodb bin mongo>db serverStatus() connections;{ "current" : 308, "available" : 511, "totalCreated" 查看mongodb最大连接数
mongodb/bin/mongo
>db.serverStatus().connections;
{ "current" : 308, "available" : 511, "totalCreated" : NumberLong(110279) }
current数值+available数值...
Too many threads are already waiting for a connection - 大数据 & AI - ...
Too many threads are already waiting for a connection由于工作线程数大于MongoDB的最大连接池数量，从而出现此类异常。解决方法：一、减少工作线程数，示意代码如下：ParallelOptions parallel 由于工作线程数大于MongoDB的最大连接池数量，从...