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Android custom dropdown/popup menu
... savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
...
Does bit-shift depend on endianness?
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Timeout on a function call
...0). Case you have a blocking I/O for 10 processes, using join(10) you have set them to wait all of them max 10 for EACH process that has started. Use daemon flag like this example stackoverflow.com/a/27420072/2480481. Of course u can pass flag daemon=True directly to multiprocessing.Process() functi...
Should logger be private static or not
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What is the lifetime of a static variable in a C++ function?
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Apply a function to every row of a matrix or a data frame
...pass additional arguments after FUN argument (as Dirk already suggested):
set.seed(1)
m <- matrix(round(runif(20, 1, 5)), ncol=4)
diag(m) <- NA
m
[,1] [,2] [,3] [,4]
[1,] NA 5 2 3
[2,] 2 NA 2 4
[3,] 3 4 NA 5
[4,] 5 4 3 NA
[5,] 2 1 4 ...
data.table vs dplyr: can one do something well the other can't or does poorly?
...over these remaining aspects as well:
Grouping operations involving a subset of rows - i.e., DT[x > val, sum(y), by = z] type operations.
Benchmark other operations such as update and joins.
Also benchmark memory footprint for each operation in addition to runtime.
2. Memory usage
Operation...
Specifically, what's dangerous about casting the result of malloc?
... returned will initially be in some register with all the significant bits set. Now the compiler say, "okay, how do I convert and int to a pointer". That's going to be either a sign extension or zero extension of the low order 32-bits that it has been told malloc "returns" by omitting the prototyp...
Is it possible to serialize and deserialize a class in C++?
...all the Boost::serialization library does, it extends the stream method by setting up a framework to write objects to a text-like format and read them from the same format.
For built-in types, or your own types with operator<< and operator>> properly defined, that's fairly simple; see ...
Extract first item of each sublist
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