use std::fs::File;
use std::io::{BufRead, BufReader};
fn main() {
let filename = "src/main.rs";
// Open the file in read-only mode (ignoring errors).
let file = File::open(filename).unwrap();
let reader = BufReader::new(file);
// Read the file line by line us...
With this example, we will see how to load a color image from disk and display it using OpenCV's built-in functions. We can use the C/C++, Python or Java bindings to accomplish this.
In C++:
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
usi...
Similarly to the SimpleXML, you can use DOMDocument to parse XML from a string or from a XML file
1. From a string
$doc = new DOMDocument();
$doc->loadXML($string);
2. From a file
$doc = new DOMDocument();
$doc->load('books.xml');// use the actual file path. Absolute or relative
Exa...
The packages foreign and haven can be used to import and export files from a variety of other statistical packages like Stata, SPSS and SAS and related software. There is a read function for each of the supported data types to import the files.
# loading the packages
library(foreign)
library(have...
To increment date objects in Javascript, we can usually do this:
var checkoutDate = new Date(); // Thu Jul 21 2016 10:05:13 GMT-0400 (EDT)
checkoutDate.setDate( checkoutDate.getDate() + 1 );
console.log(checkoutDate); // Fri Jul 22 2016 10:05:13 GMT-0400 (EDT)
It is possible to use setD...
This example listens for input coming in over the serial connection, then repeats it back out the same connection.
byte incomingBytes;
void setup() {
Serial.begin(9600); // Opens serial port, sets data rate to 9600 bps.
}
void loop() {
// Send data only when you receive...
Packages are collections of R functions, data, and compiled code in a well-defined format. Public (and private) repositories are used to host collections of R packages. The largest collection of R packages is available from CRAN.
Using CRAN
A package can be installed from CRAN using following code...
You can create a DataFrame from a list of simple tuples, and can even choose the specific elements of the tuples you want to use. Here we will create a DataFrame using all of the data in each tuple except for the last element.
import pandas as pd
data = [
('p1', 't1', 1, 2),
('p1', 't2', 3, 4)...
There are a couple of ways to delete a column in a DataFrame.
import numpy as np
import pandas as pd
np.random.seed(0)
pd.DataFrame(np.random.randn(5, 6), columns=list('ABCDEF'))
print(df)
# Output:
# A B C D E F
# 0 -0.895467 0.386902...
So let's suppose you want to iterate only between some specific lines of a file
You can make use of itertools for that
import itertools
with open('myfile.txt', 'r') as f:
for line in itertools.islice(f, 12, 30):
# do something here
This will read through the lines 13 to 20 as i...
pd.read_excel('path_to_file.xls', sheetname='Sheet1')
There are many parsing options for read_excel (similar to the options in read_csv.
pd.read_excel('path_to_file.xls',
sheetname='Sheet1', header=[0, 1, 2],
skiprows=3, index_col=0) # etc.
Create a DataFrame from multiple lists by passing a dict whose values lists. The keys of the dictionary are used as column labels. The lists can also be ndarrays. The lists/ndarrays must all be the same length.
import pandas as pd
# Create DF from dict of lists/ndarrays
df = pd.DataFrame({'...
Function level annotations help IDEs identify return values or potentially dangerous code
/**
* Adds two numbers together.
*
* @param Int $a First parameter to add
* @param Int $b Second parameter to add
* @return Int
*/
function sum($a, $b)
{
return (int) $a + $b;
}
/**
* ...
File level metadata applies to all the code within the file and should be placed at the top of the file:
<?php
/**
* @author John Doe ([email protected])
* @copyright MIT
*/
If a class extends another class and would use the same metadata, providing it @inheritDoc is a simple way for use the same documentation. If multiple classes inherit from a base, only the base would need to be changed for the children to be affected.
abstract class FooBase
{
/**
* @par...
SyncAdapter
/**
* Define a sync adapter for the app.
* <p/>
* <p>This class is instantiated in {@link SyncService}, which also binds SyncAdapter to the system.
* SyncAdapter should only be initialized in SyncService, never anywhere else.
* <p/>
* <p>The system ca...
Given any value of type Int or Long to render a human readable string:
fun Long.humanReadable(): String {
if (this <= 0) return "0"
val units = arrayOf("B", "KB", "MB", "GB", "TB", "EB")
val digitGroups = (Mat...
In Kotlin you could write code like:
val x: Path = Paths.get("dirName").apply {
if (Files.notExists(this)) throw IllegalStateException("The important file does not exist")
}
But the use of apply is not that clear as to your intent. Sometimes it is clearer to create a ...
In the Project.pro file we add :
CONFIG += sql
in MainWindow.h we write :
#include <QMainWindow>
#include <QSql>
#include <QDebug>
namespace Ui
{
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWid...
