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Append column to pandas dataframe
...eUploader: {
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Is there a typical state machine implementation pattern?
...ended to support multiple state machines, etc. Transition actions can be accommodated as well:
typedef void transition_func_t( instance_data_t *data );
void do_initial_to_foo( instance_data_t *data );
void do_foo_to_bar( instance_data_t *data );
void do_bar_to_initial( instance_data_t *data );
voi...
C++ project organisation (with gtest, cmake and doxygen)
...e weird stuff you can find so it is not surprising that a lot
of questions come up. I'll try to walk through the questions one by one and mention some general things regarding building C++ libraries.
Separating headers and cpp files in directories. This is only
essential if you are building a compo...
Connect Java to a MySQL database
...attern for the DB connection is a bad approach. See among other questions: http://stackoverflow.com/q/9428573/. This is a #1 starters mistake.
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Standardize data columns in R
...ter", "scale"))
newData <- predict(preObj, data[, -10])
More details: http://www.inside-r.org/node/86978
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How to encrypt/decrypt data in php?
... from a reliable random number generator. The following example would be recommended (>= 5.3):
$key_size = 32; // 256 bits
$encryption_key = openssl_random_pseudo_bytes($key_size, $strong);
// $strong will be true if the key is crypto safe
This can be done once or multiple times (if you wish t...
Easiest way to activate PHP and MySQL on Mac OS 10.6 (Snow Leopard), 10.7 (Lion), 10.8 (Mountain Lio
... the free TextWrangler or vi or nano will do too), and open:
/etc/apache2/httpd.conf
Find the line:
"#LoadModule php5_module libexec/apache2/libphp5.so"
And uncomment it (remove the #).
Download and install the latest MySQL version from mysql.com. Choose the x86_64 version for Intel (...
Good ways to sort a queryset? - Django
...jango 1.4 and newer you can order by providing multiple fields.
Reference: https://docs.djangoproject.com/en/dev/ref/models/querysets/#order-by
order_by(*fields)
By default, results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model’s Meta. You can...
Proper use of beginBackgroundTaskWithExpirationHandler
... to start the network operation. If you just want an existing operation to complete, as per @Eyal's question, you don't need to do anything in applicationDidEnterBackground
– Ashley Mills
Aug 3 '12 at 20:03
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java.lang.OutOfMemoryError: bitmap size exceeds VM budget - Android
...ooking at your code. However, this article has some tips that might help:
http://android-developers.blogspot.de/2009/01/avoiding-memory-leaks.html
In particular, using static variables is likely to make things worse, not better. You might need to add code that removes callbacks when your applicati...