Listing files in a zip archive is done with unzip function from the utils package (which is included in base R).
unzip(zipfile = "bar.zip", list = TRUE)
This will list all files in "bar.zip" and extract none. Tilde expansion is done automatically from your working directory. ...
Listing files in a tar archive is done with untar function from the utils package (which is included in base R).
untar(zipfile = "bar.tar", list = TRUE)
This will list all files in "bar.tar" and extract none. Tilde expansion is done automatically from your working directory. ...
Extracting files from a tar archive is done with untar function from the utils package (which is included in base R).
untar(tarfile = "bar.tar", exdir = "./foo")
This will extract all files in "bar.tar" to the "foo" directory, which will be created if nece...
https://github.com/jaymedavis/stripe.net is a great starting point.
Assuming you are using MVC w/Razor you need to have a few things in your View page
<script type="text/javascript" src="https://js.stripe.com/v2/"></script>
This script calls upon the stripe.js t...
In Swift you can easily separate a String into an array by slicing it at a certain character:
3.0
let startDate = "23:51"
let startDateAsArray = startDate.components(separatedBy: ":") // ["23", "51"]`
2.2
let startDate = "23:51"
let sta...
Build yourself three servers using whatever physical or virtual hardware you wish. (This tutorial assumes you're using Ubuntu as your operating system.) Then repeat the following instructions three times... once for each server.
# add the names of each server to the host file of each server
sudo n...
Sorting arrays can be easily done with the Arrays api.
import java.util.Arrays;
// creating an array with integers
int[] array = {7, 4, 2, 1, 19};
// this is the sorting part just one function ready to be used
Arrays.sort(array);
// prints [1, 2, 4, 7, 19]
System.out.println(Arrays.toString...
You can clear the console window using the console.clear() method. This removes all previously printed messages in the console and may print a message like "Console was cleared" in some environments.
The Dashboard module provides a splash page for the CMS in SilverStripe 3 with configurable widgets that display relevant information. Panels can be created and extended easily. The goal of the Dashboard module is to provide users with a launchpad for common CMS actions such as creating specific pag...
Similar to currying, partial application is used to reduce the number of arguments passed to a function. Unlike currying, the number need not go down by one.
Example:
This function ...
function multiplyThenAdd(a, b, c) {
return a * b + c;
}
... can be used to create another function that...
Join parent objects with their child entities, for example we want a relational table of each person and their hobbies
DECLARE @json nvarchar(1000) =
N'[
{
"id":1,
"user":{"name":"John"},
"hobbies":[
{...
Modules have a one-to-one correspondence with source files. The module name is, by default, the file name with the path and extension stripped off, and can be set explicitly with the module declaration.
The ModuleDeclaration sets the name of the module and what package it belongs to. If absent, the...
A simple cursor syntax, operating on a few example test rows:
/* Prepare test data */
DECLARE @test_table TABLE
(
Id INT,
Val VARCHAR(100)
);
INSERT INTO @test_table(Id, Val)
VALUES
(1, 'Foo'),
(2, 'Bar'),
(3, 'Baz');
/* Test data prepared */
/* Iterator variabl...
For multiple quotechars use regex in place of sep:
df = pd.read_csv(log_file,
sep=r'\s(?=(?:[^"]*"[^"]*")*[^"]*$)(?![^\[]*\])',
engine='python',
usecols=[0, 3, 4, 5, 6, 7, 8],
names=['ip', 'time', 'request', 'statu...
You can set a setUp and tearDown function.
A setUp function prepares your environment to tests.
A tearDown function does a rollback.
This is a good option when you can't modify your database and you need to create an object that simulate an object brought of database or need to init a configu...
Given this setup code:
var dict = new Dictionary<int, string>()
{
{ 1, "First" },
{ 2, "Second" },
{ 3, "Third" }
};
Use the Remove method to remove a key and its associated value.
bool wasRemoved = dict.Remove(2);
Executing this code remo...
Julia provides macros to simplify distributing computation across multiple machines or workers. For instance, the following computes the sum of some number of squares, possibly in parallel.
function sumofsquares(A)
@parallel (+) for i in A
i ^ 2
end
end
Usage:
julia> sumo...
pushunique!(A, x) = x in A ? A : push!(A, x)
The ternary conditional operator is a less wordy if...else expression.
The syntax specifically is:
[condition] ? [execute if true] : [execute if false]
In this example, we add x to the collection A only if x is not already in A. Otherwise, we jus...
