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ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
...wo arrays to be evaluated in boolean context (by
calling __bool__ in Python3 or __nonzero__ in Python2).
Your original code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any() or ...
Truly understanding the difference between procedural and functional
...st couldn't resist because I think it is truly foundational.
Addendum - 2013
Commentators point out that popular contemporary languages offer other styles of programming over and above procedural and functional. Such languages often offer one or more of the following programming styles:
query...
How to convert float to int with Java
...|
edited May 7 '15 at 18:03
user719662
answered Aug 18 '09 at 17:41
...
Clean ways to write multiple 'for' loops
...ure. If
you need a three dimensional matrix, you define one:
class Matrix3D
{
int x;
int y;
int z;
std::vector<int> myData;
public:
// ...
int& operator()( int i, int j, int k )
{
return myData[ ((i * y) + j) * z + k ];
}
};
Or if you want to in...
Citrix服务器虚拟化：XenApp 6.5发布服务器上的应用程序 - 更多技术 - 清泛...
...定）路径。
单击浏览可查看网络中的可用内容资源。
3) 应用程序：发布安装在场中的一台或多台服务器上的应用程序。请注意，如果您在某个不属于场成员的计算机上运行 AppCenter，则无法发布本地应用程序
应用程序交付...
CentOS+Nginx+PHP+MySQL详细配置(图解) - PHP - 清泛IT论坛，有思想、有深度
本帖最后由 zqp2013 于 2015-4-26 14:29 编辑
一、安装MySQL
目前web服务器已经很少有跑静态页面的，如果要跑动态网站那当然就离不开数据库，虽然在以前文章中有写MySQL是怎么安装的，但是感觉好久没...
__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...nt(const char *format,...) __attribute__((format(printf,1,2)));
//m=2；n=3
extern void myprint(int l，const char *format,...)
__attribute__((format(printf,2,3)));
需要特别注意的是，如果myprint是一个函数的成员函数，那么m和n的值可有点“悬乎”了，例如：
//...
Define variable to use with IN operator (T-SQL)
...List VALUES (1)
INSERT INTO @MyList VALUES (2)
INSERT INTO @MyList VALUES (3)
INSERT INTO @MyList VALUES (4)
SELECT *
FROM MyTable
WHERE MyColumn IN (SELECT Value FROM @MyList)
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Write a function that returns the longest palindrome in a given string
... found here and here.
For input String s = "HYTBCABADEFGHABCDEDCBAGHTFYW1234567887654321ZWETYGDE" it finds the correct output which is 1234567887654321.
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CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...e.html
CMake使用步骤：
运行GUI的cmake界面：
cmake-2.8.1-win32-x86/bin/cmake-gui.exe
执行Configure：
运行之后，生成了如下文件：
生成Makefile：
执行Generate之后生成如下文件：
运行make进行编译：
编译完成后，在build目录生成Tut...