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Python - abs vs fabs
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What is the iBeacon Bluetooth Profile
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It seems to based on advertisement data, particularly the manufacturer data:
4C00 02 15 585CDE931B0142CC9A1325009BEDC65E 0000 0000 C5
<company identifier (2 bytes)> <type (1 byte)> <data length (1 byte)>
<uuid ...
How does git store files?
...ta.
Conceptually, most other systems store information as a list of file-based changes. These systems (CVS, Subversion, Perforce, Bazaar, and so on) think of the information they keep as a set of files and the changes made to each file over time
Git doesn’t think of or store its data this...
STL or Qt containers?
...tandardized, doesn't change with every Qt version (Qt 2 had QList (pointer-based) and QValueList (value-based); Qt 3 had QPtrList and QValueList; Qt 4 now has QList, and it's nothing at all like QPtrList or QValueList).
Even if you end up using the Qt containers, use the STL-compatible API subset (i...
How can i get the session object if i have the entity-manager
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Select rows of a matrix that meet a condition
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How can I obtain an 'unbalanced' grid of ggplots?
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Skipping Iterations in Python
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“Wrong type argument: commandp” error when binding a lambda to a key
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How to set a default value for a datetime column to record creation time in a migration?
...ce some sql code in the migration for setting the default value at the database level, something like:
execute 'alter table foo alter column starts_at set default now()'
Setting something like this:
create_table :foo do |t|
t.datetime :starts_at, :null => false, :default => Time.now
end
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