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Wednesday, 24 October 2018

About R proramming by MD

R logo.svg

Posted as MD
R is a programming language and freesoftware environment for statistical computing and graphics supported by the R Foundation for Statistical Computing.[6] The R language is widely used among statisticiansand data miners for developing statistical software[7] and data analysis.[8] Polls, data mining surveys and studies of scholarly literature databases, show substantial increases in popularity in recent years.[9] As of August 2018, R ranks 18th in the TIOBE index, a measure of popularity of programming languages.[10]


R is an implementation of the S programming language combined with lexical scopingsemantics, inspired by Scheme.[15] S was created by John Chambers in 1976, while atBell Labs. There are some important differences, but much of the code written for S runs unaltered.[16]
R was created by Ross Ihaka and Robert Gentleman[17] at the University of Auckland, New Zealand, and currently developed by theR Development Core Team (of which Chambers is a member).[18] R is named partly after the first names of the first two R authors and partly as a play on the name of S.[19] The project was conceived in 1992, with an initial version released in 1995 and a stable beta version in 2000.[20][21][22]

Statistical featuresEdit

R and its libraries implement a wide variety of statistical and graphical techniques, includinglinear and nonlinear modelling, classical statistical tests, time-series analysis, classification, clustering, and others. R is easily extensible through functions and extensions, and the R community is noted for its active contributions in terms of packages. Many of R's standard functions are written in R itself, which makes it easy for users to follow the algorithmic choices made. For computationally intensive tasks, CC++, andFortran code can be linked and called at run time. Advanced users can write C, C++,[23]Java,[24] .NET[25] or Python code to manipulate R objects directly.[26] R is highly extensible through the use of user-submitted packages for specific functions or specific areas of study. Due to its S heritage, R has strongerobject-oriented programming facilities than most statistical computing languages. Extending R is also eased by its lexical scoping rules.[27]
Another strength of R is static graphics, which can produce publication-quality graphs, including mathematical symbols. Dynamic and interactive graphics are available through additional packages.[28]
R has Rd, its own LaTeX-like documentation format, which is used to supply comprehensive documentation, both online in a number of formats and in hard copy.[29]

R has vibrant and active local communities worldwide for users to network, share ideas and learn.[69][70]
There are regular R-user meetups[71] and a more focused R-Ladies[72] group

R logo.svg
Designed byRoss Ihaka and Robert Gentleman
DeveloperR Core Team[1]
First appearedAugust 1993; 25 years ago[2]

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What is the difference between http and https? By MD

What is the difference between http and https?

Some of you may be aware of this difference, but it is
worth sharing for many that are not.

The main difference between http:// and https:// is all about keeping you secure.

HTTP stands  for Hyper Text Transfer Protocol.
The S (big  surprise)  stands for "Secure". If you visit a Website or web page, and look at the address in the web browser, it is likely begin with the following: http:///.

This means that the website is talking to your browser using
the regular unsecured language. In other words, it is possible for someone to  "eavesdrop" on your computer's conversation with  the Website. If you fill out a form on the website, someone might see the information you send to that site.
This is why you never ever enter your credit card number in an
Http website! But if the web address begins with https://, that means your computer is talking to the website in  a
Secure code that no one can eavesdrop on.

Now, you understand why this is so important, right?
If a website ever asks you to enter your Credit/Debit card
Information, you should automatically look to see if the web
address begins with https://.
If  it doesn't, you should NEVER enter sensitive Information such as a credit/debit card number.
PLS PASS IT ON (You may save someone a lot of grief).

While checking the name of any website, first look for the domain extension (.com or .org,, .net  etc). The name just before this is the domain name of the website. Eg, in the above example, http:// amazon . diwali-festivals . com, the word before .com is "diwali-festivals" (and NOT "amazon"). So, this webpage does not belong to amazon . com but belongs to "diwali-festivals . com", which we all haven't heard of before.
You can similarly check for bank frauds.
Before your ebanking logins, make sure that the name just before ".com" is the name of your bank. "Something. icicibank . com" belongs to icici; but, icicibank. some1else . com belongs to "some1els.

You've hopemd lectures
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How to join MD computer class group

Posted by Md
This is the link for you to join md computer class pls do do share the link
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