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When to use in vs ref vs out
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404
You should use out unless you need ref.
It makes a big difference when the data needs to be ma...
What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
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edited Jun 17 '13 at 2:20
icktoofay
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answe...
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
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最新版拓展下载：
edu.mit.appinventor.ble-20230728.aix
低功耗蓝牙，也称为蓝牙LE 或简称 BLE，是一种类似于经典蓝牙的新通信协议，不同之处在于它旨在消耗更少的功耗和成本，同时保持同等的功能。
因此，低功耗...
Simple way to calculate median with MySQL
...um+1 as `row_number`, @total_rows:=@rownum
FROM data d, (SELECT @rownum:=0) r
WHERE d.val is NOT NULL
-- put some where clause here
ORDER BY d.val
) as dd
WHERE dd.row_number IN ( FLOOR((@total_rows+1)/2), FLOOR((@total_rows+2)/2) );
Steve Cohen points out, that after the first pass, @rown...
How to check if command line tools is installed
I have a macbook pro with OS X 10.8.2.
XCode is installed. I know this as it appears in the Applications directory.
There are also the xcodebuild and xcode-select files in /usr/bin
I need to know if the command line tools is installed.
Is there a command for it?
What can I do to see if XCode CLT is ...
Is there a rule-of-thumb for how to divide a dataset into training and validation sets?
...for how to best divide data into training and validation sets? Is an even 50/50 split advisable? Or are there clear advantages of having more training data relative to validation data (or vice versa)? Or is this choice pretty much application dependent?
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How to get the absolute coordinates of a view
...as they all seem to be relative to the parent of the view, thus giving me 0 . What is the proper way to do this?
11 Answer...
C++ display stack trace on exception
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answered Mar 27 '09 at 22:55
Andrew GrantAndrew Grant
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py2exe - generate single executable file
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106
PyInstaller will create a single .exe file with no dependencies; use the --onefile option. It d...
how to check and set max_allowed_packet mysql variable [duplicate]
...edited Jun 3 '16 at 5:47
lhrec_106
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answered Apr 16 '11 at 18:08
glebtvgl...