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Writing commands in R

The R programming language is basically command-line (interpreter-type) programming. We can perform any type of mathematical and statistical calculation, including data management analysis and graphics in the command line. The `R` command window is known as the R console, where the command and the results are produced upon execution of a given command.

Here is a very basic example of using the R console:

```> (44/55)*100
[1] 80
> log(25)
[1] 3.218876
> log10(25)
[1] 1.39794
> exp(0.23)
[1] 1.2586
> 453/365.25
[1] 1.240246
> 1-5*0.2
[1] 0
> 1-0.2-0.2-0.2-0.2-0.2 # An interesting calculation
[1] 5.551115e-17```

Using the R console, we can perform any type of calculation, but we always need to preserve the code to reproduce the result ...

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