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How to count certain elements in array?
... Thor JacobsenThor Jacobsen
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58
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Common elements in two lists
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163
Use Collection#retainAll().
listA.retainAll(listB);
// listA now contains only the elements whi...
Gem::LoadError for mysql2 gem, but it's already in Gemfile
...ith rails 4.1.5) try using this version of mysql2:
gem 'mysql2', '~> 0.3.18'
Apparently mysql2 isn't still compatible with newer version of rails because rails 4.2.4 is pretty new as the time of answering this question by me 8 September 2015 so use the above line in your Gem file and run:
bu...
How do I get whole and fractional parts from double in JSP/Java?
...I get whole and fractional parts from double in JSP/Java ? If the value is 3.25 then I want to get fractional =.25 , whole = 3
...
How can I create a two dimensional array in JavaScript?
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var items = [
[1, 2],
[3, 4],
[5, 6]
];
console.log(items[0][0]); // 1
console.log(items[0][1]); // 2
console.log(items[1][0]); // 3
console.log(items[1][1]); // 4
console.log(items);
...
SQL Server : Columns to Rows
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indicatorvalue
for indicatorname in (Indicator1, Indicator2, Indicator3)
) unpiv;
Note, the datatypes of the columns you are unpivoting must be the same so you might have to convert the datatypes prior to applying the unpivot.
You could also use CROSS APPLY with UNION ALL to convert the col...
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...
Show a number to two decimal places
... |
edited Dec 18 '13 at 7:58
answered Dec 19 '10 at 15:14
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How to get the first column of a pandas DataFrame as a Series?
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143
>>> import pandas as pd
>>> df = pd.DataFrame({'x' : [1, 2, 3, 4], 'y' : [4, 5...