Skip to main content

The best ways to run commands in R with tips

#How to Run-commands in R:
#How to Run-commands in R:
The next step after installing R is how to run commands. You can run directly by entering commands. The other way is you need to write a R script, that contains all the series of commands. The benefit of script is you can save your commands, it saves your time. Second as a script, you can run it whenever you need.

Entering Commands
Commands can be entered directly into the R console (the window that opens when you start R),
following the red > prompt, and sent to the computer by pressing enter. For example, typing 1 + 2 and pressing enter will output the result 3:
> 1+2
[1] 3
Your entered code always follows the > prompt, and output always follows a number in square

  • Each command should take its own line of code, or else a line of code should be continued with { } 
  • It is possible to press enter before the line of code is completed, and often R will recognize this. For example, if you were to type 1 + but then press enter before typing 2, R knows that 1+ by itself doesn’t make any sense, so prompts for you to continue the line with a + sign. At this point you could continue the line by pressing 2 then enter. This commonly occurs if you forget to close parentheses or brackets. 
  • If you keep pressing enter and keep seeing a + sign rather than the regular > prompt that allows you to type new code, and if you can’t figure out why, often the easiest option is to simply press ESC, which will get you back to the normal > prompt and allow you to enter a new line of code. 
Capitalization and punctuation need to be exact in R, but spacing doesn’t matter. If you get errors when entering code, you may want to check for these common mistakes:

- Did you start your line of code with a fresh prompt (>)? If not, press ESC.
- Are your capitalization and punctuation correct?
- Are all your parentheses and brackets closed? For every forward (, {, or [, make sure there is a corresponding backwards ), }, or ]

R Script
Rather than entering commands into the console directly however, we recommend creating and using an R Script, basically a text editor for your code. A new script can be created by File -> New Script.

Code (commands) can be typed here, and then entered into the console in one of three ways:

1) Copy the code in the R script and paste in the console
2) Right-click on a line or highlighted group of lines and choose “Run line or selection”
3) Place your cursor on a line or highlight a group of lines and press CTRL+R.

Using a separate R script is nice because you can save only the code that works, making it easy to rerun and edit in the future, as opposed to the R console in which you would also have to save all your mistakes and all the output.

We recommend always saving your R Scripts so you have the commands easily accessible and editable for future use.


Popular posts from this blog

Four Tableau products a quick review and explanation

I want to share you what are the Products most popular.

Total four products. Read the details below.

Tableau desktop-(Business analytics anyone can use) - Tableau  Desktop  is  based  on  breakthrough technology  from  Stanford  University  that  lets  you drag & drop to analyze data. You can connect to  data in a few clicks, then visualize and create interactive dashboards with a few more.

We’ve done years of research to build a system that supports people’s natural  ability  to  think visually. Shift fluidly between views, following your natural train of thought. You’re not stuck in wizards or bogged down writing scripts. You just create beautiful, rich data visualizations.  It's so easy to use that any Excel user can learn it. Get more results for less effort. And it’s 10 –100x faster than existing solutions.

Tableau server
Tableau  Server  is  a  business  intelligence  application  that  provides  browser-based  analytics anyone can use. It’s a rapid-fire alternative to th…

Different Types Of Payment Cards you need to know

The Credit Card (Shopping): The purpose o this card is to buy any item withing the limit prescribed by banks to cardholder. These cards can have both Magnetic stripe and Chip cards. 
Now a days all banks are issuing credit cards with CHIP and PIN. After entering the PIN by cardholder, then transaction starts for further processing.

The debit (ATM, Cash) card is a relatively new method of payment. It is different from a credit card because the debit cardholder pays with the money available in their bank account, which is debited immediately in real time. A debit card seems to be more dangerous compared to a credit card because the debit card is directly linked to the bank checking account and usually allows ATM cash withdrawals.

On the other hand, it is more protected by the required two-factor authentication (PIN number plus card itself). The real dangerous element of many branded debit cards is that they can be processed as credit cards, without entering the PIN.

The Gift card
is simi…

The Sqoop in Hadoop story to process structural data

Why Sqoop you need while working on Hadoop-The Sqoop and its primary reason is to import data from structural data sources such as Oracle/DB2 into HDFS(also called Hadoop file system).
To our readers, I have collected a good video from Edureka which helps you to understand the functionality of Sqoop.

The comparison between Sqoop and Flume

The Sqoop the word came from SQL+Hadoop Sqoop word came from SQL+HADOOP=SQOOP. And Sqoop is a data transfer tool. The main use of Sqoop is to import and export the large amount of data from RDBMS to HDFS and vice versa. List of basic Sqoop commands Codegen- It helps to generate code to interact with database records.Create-hive-table- It helps to Import a table definition into a hiveEval- It helps to evaluateSQL statement and display the resultsExport-It helps to export an HDFS directory into a database tableHelp- It helps to list the available commandsImport- It helps to import a table from a database to HDFSImport-all-tables- It helps to import tables …