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How can the Euclidean distance be calculated with NumPy?
...er too much if you use sqrt-sum with axis=0, linalg.norm with axis=0, or
a_min_b = a - b
numpy.sqrt(numpy.einsum('ij,ij->j', a_min_b, a_min_b))
which is, by a slight margin, the fastest variant. (That actually holds true for just one row as well.)
The variants where you sum up over the second...
Moving uncommitted changes to a new branch [duplicate]
...t-so-smart idea would be to create the new branch using git checkout -b new_branch and then merging the changes in the existing branch using git merge
– markroxor
Jan 11 '19 at 5:10
...
wandbox：C++在线编译项目源码编译及原理剖析 - 开源 & Github - 清泛网 - ...
...源码编译步骤：
1、clone到本地后，首先必须执行 ./install_deps.sh 安装依赖包。
2、中间可能安装失败，再次执行他会重新开始，可以适量修改install_deps.sh脚本，仅重新安装失败的。依赖包自动下载源码安装，安装在_install目录下...
How can I detect the touch event of an UIImageView?
...swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[imgView_ addGestureRecognizer:swipeRight];
[swipeRight release];
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc]
initWithTarget:self action:@selecto...
TypeError: ObjectId('') is not JSON serializable
...
Pymongo provides json_util - you can use that one instead to handle BSON types
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boost多索引容器multi_index_container实战 - C/C++ - 清泛网 - 专注C/C++及内核技术
boost多索引容器multi_index_container实战boost多索引容器multi_index_container用法详解、性能测试等。目录：
boost多索引容器multi_index_container详解
boost多索引容器multi_index_container架构图
boost多索引容器multi_index_container性能测试
原文地...
How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?
...SB0/device/driver -> ../../../../../../../../bus/usb-serial/drivers/ftdi_sio/
lrwxrwxrwx 1 root root 0 2012-03-28 21:15 /sys/class/tty/ttyUSB1/device/driver -> ../../../../../../../../bus/usb-serial/drivers/ftdi_sio/
...
Assignment in an if statement
...g
public class Animal
{
}
public class Dog : Animal
{
private string _name;
public string Name
{
get { return _name; }
set
{
_name = value;
Console.WriteLine("Name is now " + _name);
}
}
}
public class Duck : Animal
{
pub...
Why are dashes preferred for CSS selectors / HTML attributes?
...ument.querySelector('#first-name');
var firstName = document.forms[0].first_name;
I find the two first options much more preferable, especially since '#first-name' can be replaced with a JavaScript variable and built dynamically. I also find them more pleasant on the eyes.
The fact that Sass enab...
List comprehension vs map
...oints, but sometimes map seems easier to read to me: data = map(str, some_list_of_objects). Some other ones... operator.attrgetter, operator.itemgetter, etc.
– Gregg Lind
Aug 8 '09 at 16:06
...