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How can we access context of an application in Robolectric?
...tually, I need to get a response of an API call, for that I required Context .
14 Answers
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Select Pandas rows based on list index
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List = [1, 3]
df.ix[List]
should do the trick!
When I index with data frames I always use the .ix() method. Its so much easier and more flexible...
UPDATE
This is no longer the accepted method for indexing. The ix method is deprecated. Use...
Specialization with Constraints
...ng GHC to specialize a function with a class constraint. I have a minimal example of my problem here: Foo.hs and Main.hs . The two files compile (GHC 7.6.2, ghc -O3 Main ) and run.
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numpy matrix vector multiplication [duplicate]
When I multiply two numpy arrays of sizes (n x n)*(n x 1), I get a matrix of size (n x n). Following normal matrix multiplication rules, a (n x 1) vector is expected, but I simply cannot find any information about how this is done in Python's Numpy module.
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Insert at first position of a list in Python [closed]
How can I insert an element at the first index of a list ?
If I use list.insert(0,elem), do elem modify the content of the first index?
Or do I have to create a new list with the first elem and then copy the old list inside this new one?
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C/C++ 如何向上取整？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...用floor函数（整数直接除就ok）。
使用floor函数。floor(x)返回的是小于或等于x的最大整数。
如： floor(10.5) == 10 floor(-10.5) == -11
使用ceil函数。ceil(x)返回的是大于x的最小整数。
如： ceil(10.5) == 11 ceil(-10.5) ==-10
floor()...
Windows下如何判断Win32 or x64？ - C/C++ - 清泛网 - 专注C/C++及内核技术
Windows下如何判断Win32 or x64？MSDN 里说，VC 有 3 个预处理常量，分别是 _WIN32，_WIN64，WIN32。这三个常量如何使用呢？看起来简单，其实是很困惑的。 在 Win3...MSDN 里说，VC 有 3 个预处理常量，分别是 _WIN32，_WIN64，WIN32。这三个...
如何把一个POINT转化为lParam参数 - C/C++ - 清泛网 - 专注C/C++及内核技术
如何把一个POINT转化为lParam参数MAKELPARAM(pt.x, pt.y);反之：CPoint point(lParam);里面的实现是：CPoint(_In_ LPARAM dwPoint) throw();...ATLTYPES_INLINE CPoin...MAKELPARAM(pt.x, pt.y);
反之：
CPoint point(lParam);
里面的实现是：
CPoint(_In_ LPARAM dwPoint) thro...
linux ls、ll命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
linux ls、ll命令详解ls只是简单的列出目录下文件名，ll更加详细的列出了文件的类型、文件所有者权限、文件所有者组权限、文件大小、文件最后修改时间。ls只是简单的列出目录下文件名，ll更加详细的列出了文件的类型、文件...
js中int和string互换（js int转string，js string转int） - 更多技术 - 清...
...以参照如下方法：
一、Javascript 将 int 转 string
(1)
var x = 100;
a = x.toString();
(2)
var x = 100;
a = x + ""; //JS会自动隐性转换
二、Javascript 将string 变成 int
var s = "32"
var i = new Number(s);
或
var i = parseInt(s);
parseInt返回值：
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