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How to update attributes without validation
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edited Jan 10 at 5:42
Nathan
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answered Jun 8 '10 at 15:3...
Find the day of a week
...ric weekday (0-6 starting on Sunday).
as.POSIXlt(df$date)$wday
## [1] 3 3 4
which you could use to subset a character vector of weekday names
c("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
"Friday", "Saturday")[as.POSIXlt(df$date)$wday + 1]
## [1] "Wednesday" "Wednesday" "Thursda...
C: What is the difference between ++i and i++?
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1142
++i will increment the value of i, and then return the incremented value.
i = 1;
j = ++i;
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Convert a bitmap into a byte array
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430
There are a couple ways.
ImageConverter
public static byte[] ImageToByte(Image img)
{
Im...
SSL Error When installing rubygems, Unable to pull data from 'https://rubygems.org/
...ng to do the Michael Hartl tutorial. When I attempt to install rails 3.2.14 in my gemset, I get the following issue:
24 An...
Undefined reference to static class member
Can anyone explain why following code won't compile? At least on g++ 4.2.4.
7 Answers
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How to set Sqlite3 to be case insensitive when string comparing?
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499
You can use COLLATE NOCASE in your SELECT query:
SELECT * FROM ... WHERE name = 'someone' COL...
Access is denied when attaching a database
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MandoMandoMandoMando
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convert string array to string
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answered Jan 30 '11 at 5:54
Dave WardDave Ward
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How to close activity and go back to previous activity in android
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Ajay SAjay S
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