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How to append rows to an R data frame
..., and then, at the end, create your data.frame.
Continuing with Julian's f3 (a preallocated data.frame) as the fastest option so far, defined as:
# pre-allocate space
f3 <- function(n){
df <- data.frame(x = numeric(n), y = character(n), stringsAsFactors = FALSE)
for(i in 1:n){
df$x[i...
How does Spring Data JPA differ from Hibernate for large projects?
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How to generate an openSSL key using a passphrase from the command line?
...ase, the password is foobar):
openssl genrsa -aes128 -passout pass:foobar 3072
However, note that this passphrase could be grabbed by any other process running on the machine at the time, since command-line arguments are generally visible to all processes.
A better alternative is to write the pa...
The current SynchronizationContext may not be used as a TaskScheduler
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How to create a directory using nerdtree
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housetierhousetier
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Is it possible to set UIView border properties from interface builder?
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393
Actually you can set some properties of a view's layer through interface builder. I know that ...
CursorLoader usage without ContentProvider
...kLoader;
/**
* Used to write apps that run on platforms prior to Android 3.0. When running
* on Android 3.0 or above, this implementation is still used; it does not try
* to switch to the framework's implementation. See the framework SDK
* documentation for a class overview.
*
* This was base...
Python, creating objects
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edited Dec 3 '13 at 16:43
Darlesson
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Cleaner way to update nested structures
...reproduce his example here:
scala> @zip case class Pacman(lives: Int = 3, superMode: Boolean = false)
scala> @zip case class Game(state: String = "pause", pacman: Pacman = Pacman())
scala> val g = Game()
g: Game = Game("pause",Pacman(3,false))
// Changing the game state to "run" is sim...