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Using arrays or std::vectors in C++, what's the performance gap?
...en from the internet):
// Comparison of assembly code generated for basic indexing, dereferencing,
// and increment operations on vectors and arrays/pointers.
// Assembly code was generated by gcc 4.1.0 invoked with g++ -O3 -S on a
// x86_64-suse-linux machine.
#include <vector>
struct...
Easiest way to check for an index or a key in an array?
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To check if the element is set (applies to both indexed and associative array)
[ ${array[key]+abc} ] && echo "exists"
Basically what ${array[key]+abc} does is
if array[key] is set, return abc
if array[key] is not set, return nothing
References:
See Parame...
How do I write LINQ's .Skip(1000).Take(100) in pure SQL?
...with the @skip! The row_number approach does NOT have this (only tested on indexed order). For lo @Skip less about 20, the new syntax is faster than the row_number approach though.
– Eske Rahn
Jun 24 '18 at 14:23
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How do I tidy up an HTML file's indentation in VI?
How do I fix the indentation of his huge html files which was all messed up?
11 Answers
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how do I make a single legend for many subplots with matplotlib?
...label('time (hours)')
ax.set_ylabel('CONC ($\mu g. m^{-3}$)')
for index in range(len(level)):
conc = dados.variables['CONC'][4:12,index] * 1e9
ax.plot(conc,label=str(level[index])+'m')
dados.close()
ax.legend(bbox_to_anchor=(1.05, 0), loc='lower left', borderaxespad=0....
How to use Python to login to a webpage and retrieve cookies for later usage?
...gin moment involves sending two POST params (username, password) to /login.php. During the login request I want to retrieve the cookies from the response header and store them so I can use them in the request to download the webpage /data.php.
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PHP string “contains” [duplicate]
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程序员，你有多久没有跳出技术关注业界了？ - 创意 - 清泛网 - 专注C/C++及内核技术
...。产品经常迭代演进，也需要技术人员不断关注。比如做PHP开发的童鞋，应该关注到当今PHP7已经发布，而且到了RC5 版，PHP7 的性能对比PHP 5.x的提升，无论是在响应速度还是在内存的优化方面，都是百分之百以上的提升。其次，...
Parse error: syntax error, unexpected end of file in xxx 的解决办法 - ...
...unexpected end of file in xxx 的解决办法出现此提示一般是因为PHP代码中使用了 缩短的PHP开始和结束标签，如： <? ?> 。解决办法如下如下两种：第1种办法：将代码中的<? ?>全...出现此提示一般是因为PHP代码中使用了 缩短的PHP开始和结...
PDO MySQL扩展模块 检测通不过的解决方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
PDO MySQL扩展模块 检测通不过的解决方法php.in中下面两行已经放开注释：extension=pdo.soextension=pdo_mysql.soPDO检测仍然通不过。终极解决方案：php编译时加上如下参数，重新编...php.in中下面两行已经放开注释：
extension=pdo.so
extension=pdo...