Tutorial by Examples: n

For creating custom annotations we need to decide Target - on which these annotations will work on like field level, method level, type level etc. Retention - to what level annotation will be available. For this, we have built in custom annotations. Check out these mostly used ones: @Target...

This way can be so helpfull, but, some people (like me) are afreak of repeat code, and like you are showin us, it means that I need to create a contact controller with the same code on each proyect that we have, so, I thing that this can be helpfull too This is my class, that can be on a DLL or wha...

You can create a new notebook in RStudio with the menu command File -> New File -> R Notebook If you don't see the option for R Notebook, then you need to update your version of RStudio. For installation of RStudio follow this guide

Chunks are pieces of code that can be executed interactively. In-order to insert a new chunk by clicking on the insert button present on the notebook toolbar and select your desired code platform (R in this case, since we want to write R code). Alternatively we can use keyboard shortcuts to insert a...

You can run the current chunk by clicking Run current Chunk (green play button) present on the right side of the chunk. Alternatively we can use keyboard shortcut Ctrl + Shift + Enter (OS X: Cmd + Shift + Enter) The output from all the lines in the chunk will appear beneath the chunk. Splitting Co...

When you execute code in a notebook, an indicator will appear in the gutter to show you execution progress. Lines of code which have been sent to R are marked with dark green; lines which have not yet been sent to R are marked with light green. Executing Multiple Chunks Running or Re-Running indiv...

When a notebook .Rmd is saved, an .nb.html file is created alongside it. This file is a self-contained HTML file which contains both a rendered copy of the notebook with all current chunk outputs (suitable for display on a website) and a copy of the notebook .Rmd itself. More info can be found at R...

To get the latest release go to https://cran.r-project.org/ and download the file for your operating system. Open the downloaded file and follow the on-screen installation steps. All the settings can be left on default unless you want to change a certain behaviour.

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.

You can check R Version using the console version

A Django model typically refers to a table in the database, attributes of that model becomes the column of that table. In more of a real-world example, you would create a model for any entity in your application, and store its attributes with django fields which automatically handles data-types conv...

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 ...

Many packages for example on version 3.4 would run on 3.6 just fine, but if there are no distributions for specific platform, they can't be installed, but there is workaround. In .whl files (known as wheels) naming convention decide whether you can install package on specified platform. Eg. scikit_l...

binary_to_term().

Initializing data structure #include <stdio.h> #include <string.h> #include <ei.h> Encoding number #include <stdio.h> #include <ei.h> int main() { } Encoding atom Encoding tuple Encoding list Encoding map

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'...