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Factors in R: more than an annoyance?
... = Petal.Length ~ -1 + Species, data = iris)
# Coefficients:
# Speciessetosa Speciesversicolor Speciesvirginica
# 1.462 4.260 5.552
iris.alt <- iris
iris.alt$Species <- as.character(iris.alt$Species)
lm(Petal.Length ~ -1 + Species, data=iris.a...
Recursively counting files in a Linux directory
How can I recursively count files in a Linux directory?
21 Answers
21
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How to find list of possible words from a letter matrix [Boggle Solver]
...ost it because it looks a bit faster than the other Python solutions, from setting up the dictionary faster. (I checked this against John Fouhy's solution.) After setup, the time to solve is down in the noise.
grid = "fxie amlo ewbx astu".split()
nrows, ncols = len(grid), len(grid[0])
# A dictiona...
Can I specify multiple users for myself in .gitconfig?
...
you can see the effects of these settings in the .git/config file
– Abizern
Nov 18 '10 at 23:15
24
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Remove not alphanumeric characters from string
...e character n.
To replace a control character you need to use a character set like [\r], as \r has a special meaning in a regular expression:
var input = "\\test\red\bob\fred\new";
var output = input
.replace(/[\r]/g, 'r')
.replace(/[\b]/g, 'b')
.replace(/[\f]/g, 'f')
.replace(/[\...
Avoiding if statement inside a for loop?
...1, you can do something like this:
#include <iostream>
#include <set>
#include <vector>
template <typename Container, typename Functor, typename Index = std::size_t>
void for_each_indexed(const Container& c, Functor f, Index index = 0) {
for (const auto& e : c)...
Find CRLF in Notepad++
...
On the Replace dialog, you want to set the search mode to "Extended". Normal or Regular Expression modes wont work.
Then just find "\r\n" (or just \n for unix files or just \r for mac format files), and set the replace to whatever you want.
...
How do I shutdown, restart, or log off Windows via a bat file?
.... Prevents the shutdown process from getting stuck.
-t <seconds> — Sets the time until shutdown. Use -t 0 to shutdown immediately.
-c <message> — Adds a shutdown message. The message will end up in the Event Log.
-y — Forces a "yes" answer to all shutdown queries.
Note: This optio...
Python int to binary string?
..., receiving intVal:
if intVal is equal to zero:
return "0"
set strVal to ""
while intVal is greater than zero:
if intVal is odd:
prefix "1" to strVal
else:
prefix "0" to strVal
divide intVal by two, rounding down
return strVal
...
filter for complete cases in data.frame using dplyr (case-wise deletion)
...in before passing it to the filter.
Another benchmark with more columns:
set.seed(123)
x <- sample(1e5,1e5*26, replace = TRUE)
x[sample(seq_along(x), 1e3)] <- NA
df <- as.data.frame(matrix(x, ncol = 26))
library(microbenchmark)
microbenchmark(
na.omit = {df %>% na.omit},
filter.ano...