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Difference between numpy.array shape (R, 1) and (R,)
... is that they consist of two parts, a data buffer which is just a block of raw elements, and a view which describes how to interpret the data buffer.
For example, if we create an array of 12 integers:
>>> a = numpy.arange(12)
>>> a
array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1...
How to implement common bash idioms in Python? [closed]
...ia ./scriptname.ipy - if it fails with recognizing % and !
# but parses raw python fine, please check again for the .ipy suffix
# ugly example, please go and find more in the wild
files = !ls *.* | grep "y"
for file in files:
!echo $file | grep "p"
# sorry for this nonsense example ;)
See IP...
When is a C++ destructor called?
... the vector.
To manage that, what vector does under the covers is allocate raw memory via the Allocator object (which, unless you specify otherwise, means it uses ::operator new). Then, when you use (for example) push_back to add an item to the vector, internally the vector uses a placement new to c...
How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...pip:
sudo easy_install pip
Install brew:
ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
Install mysql:
brew install mysql
Install MySQLdb
sudo pip install MySQL-python
If you have compilation problems, try editing the ~/.profile file like in one of the answer...
Unable to find valid certification path to requested target - error even after cert imported
...with:
plaintext hex dump of record plaintext
packet print raw SSL/TLS packets
Source: # See http://download.oracle.com/javase/1.5.0/docs/guide/security/jsse/JSSERefGuide.html#Debug
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Using arrays or std::vectors in C++, what's the performance gap?
... a std::array.
Uninitialized memory
Sometimes, using a vector instead of a raw buffer incurs a visible cost because the vector will initialize the buffer at construction, while the code it replaces didn't, as remarked bernie by in his answer.
If this is the case, then you can handle it by using a un...
what is the difference between OLE DB and ODBC data sources?
... both relational and non-relational databases. (Oracle, Sql-Server, Excel, raw files, etc)
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What is the most ridiculous pessimization you've seen? [closed]
...makes it too big.
Create lots of summary tables because recalculating from raw data is too slow.
Create columns with subfields to save space.
Denormalize into fields-as-an-array.
That's off the top of my head.
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Are arrays passed by value or passed by reference in Java? [duplicate]
...eference semantics in C.
Since it can often seem like the sole purpose of raw pointers in C is to create crashing bugs, subs
What's the use of Jade or Handlebars when writing AngularJs apps
... I agree with @NickWiggill. Mentally parsing a JADE template vs. raw HTML requires equal 'wetware' cpu time for me. I won't go so far as to say you're unprofessional if you disagree, but to me it's the same thing. @ Philipp, your analogy of parsing C/C++ to assembly being equal to parsin...