UI in R Studio

1. .R File – R script saved location
2. Console – code being executed
3. Environment – variable saved in memory
4. File/Plot/Package/Help – Different functionality like viewing file in explorer, help documentation of script, Cran list of library.

Code

Code reusability, introduce “package”, which is a public directory from CRAN.

library(MBA)

also similar to

import java.io;

Operation
+,-,*,/,%% → Basic Maths operators
first *, / later +, – → Operator Precedence
=, ->, <-, assign → variable declarations
rm(_{<<variable name>>}), remove(_{<<variable name>>}) → remove a variable
class → to tell datatypes(numeric,integer,character,logical,date)
is._<<datatype>>(_{<<variable name>>}) → checking/testing/validation the data type
as._<<datatype>>(_{<<variable name>>}) → convert the data type
: → range x:y, sequence number for x to y
seq(_from,_to,_by) → range from:to, sequence number for x to y, but can interval “by”
c(5,10,1) → array aka vector, index start from 1 (not 0), c also known as “combine”
names(_{<<variable name>>})=c(“one”,”two”,”three”) → gave index name to array
runif(_n, _min, _max) → generate n random number
sample(_min:_max, _n, _TRUE/FALSE) → generate n random number, True/False for repeating number appearing