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Convert column classes in data.table
...tor w/ 2 levels "A","B": 1 1 1 1 1 2 2 2 2 2
$ Quarter: chr "1" "2" "3" "4" ...
$ value : num -0.838 0.146 -1.059 -1.197 0.282 ...
Using lapply and as.character:
dtnew <- dt[, lapply(.SD, as.character), by=ID]
str(dtnew)
Classes ‘data.table’ and 'data.frame': 10 obs. of 3 variabl...
How to “add existing frameworks” in Xcode 4?
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edited Jun 4 '14 at 6:16
community wiki
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android studio 0.4.2: Gradle project sync failed error
After updating to 0.4.2 I get this error when opening a project:
'Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work proprerly'
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Designer Added then removed by Visual Studio on load/unload
...ls/757970/…
– Pat
Dec 19 '13 at 5:40
4
It's VS2015, and yet this still occurs.
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Iterate through pairs of items in a Python list [duplicate]
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94
From itertools receipes:
from itertools import tee
def pairwise(iterable):
"s -> (s0,s1)...
Maximum length for MySQL type text
... (255 Bytes)
BLOB, TEXT L + 2 bytes, where L < 2^16 (64 Kilobytes)
MEDIUMBLOB, MEDIUMTEXT L + 3 bytes, where L < 2^24 (16 Megabytes)
LONGBLOB, LONGTEXT L + 4 bytes, where L < 2^32 (4 Gigabytes)
L is the number of bytes in your text field. So the maximum numbe...
Add support library to Android Studio project
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54
I no longer work on Android project for a while.
Although the below provides some clue to how a...
How to get unique values in an array
...rr.push(this[i]);
}
}
return arr;
}
var duplicates = [1, 3, 4, 2, 1, 2, 3, 8];
var uniques = duplicates.unique(); // result = [1,3,4,2,8]
console.log(uniques);
For more reliability, you can replace contains with MDN's indexOf shim and check if each element's indexOf is equa...
Detect the specific iPhone/iPod touch model [duplicate]
...by Erica Sadun):
[[UIDevice currentDevice] platformType] // ex: UIDevice4GiPhone
[[UIDevice currentDevice] platformString] // ex: @"iPhone 4G"
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How do I do an OR filter in a Django query?
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Alex KoshelevAlex Koshelev
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