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std::vector performance regression when enabling C++11
...510495 task-clock # 0.988 CPUs utilized ( +- 2.54% )
4 context-switches # 0.101 K/sec ( +- 7.41% )
0 CPU-migrations # 0.003 K/sec ( +-100.00% )
19,801 page-fau...
CSS media queries: max-width OR max-height
...from:
CSS media queries by Mozilla Contributors (licensed under CC-BY-SA 2.5). Some code samples were used with minor alterations to (hopefully) increase clarity of explanation.
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How to read a large file - line by line?
...ays in ranked order (first is best) -
use of with - supported from python 2.5 and above
use of yield if you really want to have control over how much to read
1. use of with
with is the nice and efficient pythonic way to read large files. advantages - 1) file object is automatically closed after ex...
Understanding the Rails Authenticity Token
...okie, the server knows:
Oh, that's John Doe. He signed in successfully 2.5 minutes ago. He's good to go.
A hacker might think:
Hmm. A normal HTTP request won't work, but if I could get my hand on that session_id cookie, I'd be golden.
The users browser has a bunch of cookies set for the ...
Is std::vector so much slower than plain arrays?
...026 seconds. I also added an UseVectorEmplaceBack version which is approx. 2.5x as fast as UseVectorPushBack.
– Daniel
Aug 30 '15 at 23:12
1
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Hosting a Maven repository on github
...---------------------------------------
...
[INFO] --- maven-deploy-plugin:2.5:deploy (default-deploy) @ greendao ---
Uploaded: file:///Users/mike/Projects/greendao-emmby/DaoCore/target/mvn-repo/com/greendao-orm/greendao/1.3-SNAPSHOT/greendao-1.3-20121223.182256-3.jar (77 KB at 2936.9 KB/sec)
Upload...
JSP tricks to make templating easier?
... <artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
...
Catching an exception while using a Python 'with' statement
... the __future__ import since Python 2.6. You can get it as early as Python 2.5 (but at this point it's time to upgrade!) with:
from __future__ import with_statement
Here's the closest thing to correct that you have. You're almost there, but with doesn't have an except clause:
with open("a.txt")...
How to deal with SettingWithCopyWarning in Pandas?
...me.
Try using .loc[row_indexer,col_indexer] = value instead
df2
A
0 2.5
1 4.5
2 3.5
There are a couple ways of directly silencing this warning:
Make a deepcopy
df2 = df[['A']].copy(deep=True)
df2['A'] /= 2
Change pd.options.mode.chained_assignment
Can be set to None, "warn", or "raise...
What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)
...You can see this effect very nicely, this is from Chrome:
16: 4ms
40: 8ms 2.5
76: 20ms 1.9
130: 31ms 1.7105263157894737
211: 14ms 1.623076923076923
332: 55ms 1.5734597156398105
514: 44ms 1.5481927710843373
787: 61ms 1.5311284046692606
1196: 138ms 1.5196950444726811
1810: 139ms 1.5133779264214047
27...