Day 1.R

Enter file contents here

rm(list = ls(all.name=TRUE))

setwd("../Documents")

# Variable declaration 
# only . and _ and no digits in starting of vriable


# Data types


#Integer. only  number without decimal
a <- -1L
typeof(a)

# Numeric/Double numbers with decimal. default type when declaring a number
a <- 1
typeof(a)

# charector.. all the data with alphabets and which is inside ' and "
a <- 'Hello'
typeof(a)

# Logical ,, TRUE or FALSE
a <- T
typeof(a)

# Raw  internal data type of R
# Complex real and imaginary terms
is.integer(a)
is.numeric(a)
is.character(a)
is.logical(a)

# 
# Data structures..using the data types above hoe they can be binded to each other 
# 
# Vector-> collection of similar datatype variables
vector <- c(12,'dd',T)
vector([1]
append(vector,"b",1)


# list -> collection of R object(variables,functions,models)
list <- c(mean,'a',1)
list[[1]]
append(list,"b",1)

# Matrix ->collection of similar data types in a 2 dimensions 
matrix <- matrix(data=1:6,nrow=3)
matrix[1,2]
# Array -> similar to array with no dimensions limitation
array = array(1:4,dim = 4)
array[1]

# Factors -> defining a nominal variable type . fixing the levels in a variable
# Data Frames->tabular data
data <- 	data.frame(
  gender = c("Male", "Male","Female","Male","Female","Male"), 
  Age =c(42,38,26,33,55,66)
  name = c('ram','sham','sita','lak','rav','one')
)
data[1,1]