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How to drop columns by name in a data frame
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You should use either indexing or the subset function. For example :
R> df <- data.frame(x=1:5, y=2:6, z=3:7, u=4:8)
R> df
x y z u
1 1 2 3 4
2 2 3 4 5
3 3 4 5 6
4 4 5 6 7
5 5 6 7 8
Then you can use the which function and the - operat...
Is there a way to get the source code from an APK file?
...hat a Java Environment is installed (for Linux check the notes regarding required libraries as well)
Start: apktool decode [apk file]
Intermediate result: resource files, AndroidManifest.xml
unzip APK file with an unpacker of your choice
Intermediate result: classes.dex
download and extract dex2jar...
MySQL: multiple tables or one table with many columns?
...hich can involves seeks on a spinning disk, (2) generally require multiple indexes and some sort of merge, and (3) they make query planning harder, which not only takes time, but also increases the chances that the query optimizer will get something wrong (and badly optimized queries can be really s...
multiprocessing: How do I share a dict among multiple processes?
A program that creates several processes that work on a join-able queue, Q , and may eventually manipulate a global dictionary D to store results. (so each child process may use D to store its result and also see what results the other child processes are producing)
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How does TransactionScope roll back transactions?
... enlist with it. Caution if there are more the one connection to the same SQL server this will escalate to a Distribtued Transaction.
What happens since you're using a using block you are ensuring dispose will be called even if an exception occurs. So if dispose is called before txScope.Complete()...
How do I set the selected item in a comboBox to match my string using C#?
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This should do the trick:
Combox1.SelectedIndex = Combox1.FindStringExact("test1")
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Resolving javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path
Edit :- Tried to format the question and accepted answer in more presentable way at mine Blog
22 Answers
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Ignoring an already checked-in directory's contents?
...ory.
The --cached option causes the files to only be removed from git's index, not your working copy. By default git rm <file> would delete <file>.
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Immutable array in Java
...xisting elements with List<> aslist = Arrays.asList(...); aslist.set(index, element), so java.util.Arrays.ArrayList certainly is not unmofiable, Q.E.D. Added the comment just for the sake of emphasizing the difference between the result of asList and normal ArrayList
– N...
how to listen to N channels? (dynamic select statement)
...niform pseudo-random choice, and then executes that
case. It returns the index of the chosen case and, if that case was a
receive operation, the value received and a boolean indicating whether
the value corresponds to a send on the channel (as opposed to a zero
value received because the cha...