Tutorial by Examples: p

Before rendering the final version of a notebook we can preview the output. Click on the Preview button on the toolbar and select the desired output format. You can change the type of output by using the output options as "pdf_document" or "html_notebook"

You can also update R from within R by using a handy package called installr. Open R Console (NOT RStudio, this doesn't work from RStudio) and run the following code to install the package and initiate update. install.packages("installr") library("installr") updateR()

Once the installation is finished click the Finish button. Now it asks if you want to copy your packages fro the older version of R to Newer version of R. Once you choose yes all the package are copied to the newer version of R. After that you can choose if you still want to keep the old package...

You can update your installed packages once the updating of R is done. Once its done Restart R and enjoy exploring.

A simple example would be for a library management application; you would have 2 models, for example, student and book in models.py: from django.db import models class student(models.Model): roll_no = models.IntegerField(primary_key=True) first_name = models.CharField(max_length=30) ...

import pip command = 'install' parameter = 'selenium' second_param = 'numpy' # You can give as many package names as needed switch = '--upgrade' pip.main([command, parameter, second_param, switch]) Only needed parameters are obligatory, so both pip.main(['freeze']) and pip.main(['freeze'...

When you use python file as module there is no need always check if package is installed but it is still useful for scripts. if __name__ == '__main__': try: import requests except ImportError: print("To use this module you need 'requests' module") t ...

Simple filter expression is also an array. It contains one or more filter terms, combined with operators - 'AND', 'OR', 'NOT'. (Operators are case insensitive): [ ['mainline', 'is', 'T'], 'and', ['type','anyof',['CustInvc','CustCred']], 'and', 'not', ['amount', 'equalto', '0.00'], 'or'...

Filter expressions cannot include Filter Objects. This is very important. If you decide to form your filters with Filter Expression, you use array of string arrays. The following syntax is wrong: // WRONG!!! var f1 = search.createFilter({ name: 'mainline', operator: searc...

Interfacing of DS18B20 with Raspberry pi Connection of DS18B20 with Raspberry pi You can see there are three terminal Vcc Gnd Data (One wire protocol) R1 is 4.7k ohm resistance for pulling up the voltage level Vcc should be connected to any of the 5v or 3.3v pins of Raspberry pi (PI...

The observer pattern is a common pattern, which is widely used in many contexts. A real example can be taken from YouTube: When you like a channel and want to get all news and watch new videos from this channel, you have to subscribe to that channel. Then, whenever this channel publishes any news, y...

In this Stack Overflow question, user txtechhelp found an issue with the ^ character which could cause a security issue. Cause anyInvaildCommand ^ Note: Make sure the caret(^) is the last character! Any extra CR\LF won't work at all! The caret looks for the next character to escape. However,...

Two main techniques allow passing data between GUI functions and Callbacks: setappdata/getappdata and guidata (read more about it). The former should be used for larger variables as it is more time efficient. The following example tests the two methods' efficiency. A GUI with a simple button is cre...

Documented here in the API you see that the syntax of the call is https://api.telegram.org/bot<token>/setwebhook?url=<yoururl>. For the most part this is it. If you need more information, take a look at this guide or look at the requirements (like using HTTPS). After you set this, you c...

Detailed instructions on getting scapy set up or installed.

Detailed instructions on getting statistics set up or installed.

Code Block TypeGlobal NamespaceLocal NamespaceModulen.s. for the modulesame as globalScript (file or command)n.s. for __main__same as globalInteractive commandn.s. for __main__same as globalClass definitionglobal n.s. of containing blocknew namespaceFunction bodyglobal n.s. of containing blocknew na...

This code example creates a UDP client then sends "Hello World" across the network to the intended recipient. A listener does not have to be active, as UDP Is connectionless and will broadcast the message regardless. Once the message is sent, the clients work is done. byte[] data = Enco...

custom stuff

Download and install Code::Blocks here. If you're on Windows, be careful to select a file for which the name contains mingw, the other files don't install any compiler. Open Code::Blocks and click on "Create a new project": Select "Console application" and click &...