CW12825

R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com.

When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

data<-c(1,2,3,4,5,6)
data

## [1] 1 2 3 4 5 6

#dfdsaff
vstring<-c('a','b','c')
vstring

## [1] "a" "b" "c"

#creating a list
headings<-list(NULL, c("a", "b","c"))
headings

## [[1]]
## NULL
## 
## [[2]]
## [1] "a" "b" "c"

#matrics: same concept like mathematics
m<-matrix(data,nrow = 2, ncol = 3, byrow= TRUE, dimnames=headings)
m

##      a b c
## [1,] 1 2 3
## [2,] 4 5 6

m2<-matrix(data,nrow = 2, ncol = 3, byrow= FALSE, dimnames=headings)
m2

##      a b c
## [1,] 1 3 5
## [2,] 2 4 6

m3<-matrix(data,nrow = 3, ncol = 2, byrow= TRUE)
m3

##      [,1] [,2]
## [1,]    1    2
## [2,]    3    4
## [3,]    5    6

m4<-matrix(data,nrow = 3, ncol = 3, byrow= TRUE, dimnames=headings)

## Warning in matrix(data, nrow = 3, ncol = 3, byrow = TRUE, dimnames = headings):
## data length differs from size of matrix: [6 != 3 x 3]

m4

##      a b c
## [1,] 1 2 3
## [2,] 4 5 6
## [3,] 1 2 3

#tO print out a specific element 
m4[1,]

## a b c 
## 1 2 3

m4[ ,2]

## [1] 2 5 2

m4[3,2]

## b 
## 2

#$ is used to access a specific element of the list
a<- list(aa=1, bb=2, cc=3)
a

## $aa
## [1] 1
## 
## $bb
## [1] 2
## 
## $cc
## [1] 3

years <- c(1980, 1985, 1990)
scores <- c(34, 44, 83)
df <- data.frame(years, scores)
df[,1]

## [1] 1980 1985 1990

df$years

## [1] 1980 1985 1990

df$scores

## [1] 34 44 83

View(df)

a <- 66 
if (a > 55){
  print("a is more than 55")} else{print("a is less than or equal to 55")}

## [1] "a is more than 55"

a

## [1] 66

a <-100
while(a < 500){
  a <-a + 100
  print(a)
}

## [1] 200
## [1] 300
## [1] 400
## [1] 500

a

## [1] 500

Including Plots

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Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot.