pertemuan-3.R

#pertemuan 3 statistika komputasi

data <- c(5,7,6,8,1,2,4)
data[5]

## [1] 1

data[c (1,3,5)]

## [1] 5 6 1

data[4:7]

## [1] 8 1 2 4

data[3]= 9
data[8]= 3
data[-5]

## [1] 5 7 9 8 2 4 3

data[data>4]

## [1] 5 7 9 8

data[data<5]

## [1] 1 2 4 3

data[data>3 & data<8]

## [1] 5 7 4

data[data>7 | data<4]

## [1] 9 8 1 2 3

#fungsi / funcition
nilai <- c(75,78,77,80,82,74,90)


#Length / panjang data / banyak data
length(nilai)

## [1] 7

#sort / mengurutkan
sort(nilai)

## [1] 74 75 77 78 80 82 90

sort(nilai,decreasing = TRUE)

## [1] 90 82 80 78 77 75 74

#sum / menjumlahkan
sum(nilai)

## [1] 556

#mean / rata rata
mean(nilai)

## [1] 79.42857

#min / nilai minimun
min(nilai)

## [1] 74

#max / nilai maximum
max(nilai)

## [1] 90

#sqrt / akar
sqrt(max (nilai))

## [1] 9.486833

a <- c(10,10,30,10,30,10,10,40,40,70,90,70,80,60,60,90)
table(a)/length(a)

## a
##     10     30     40     60     70     80     90 
## 0.3125 0.1250 0.1250 0.1250 0.1250 0.0625 0.1250

b <- c("ya","ya","tidak","tidak","ya","ya","tidak","tidak")
table(b)/length(b)

## b
## tidak    ya 
##   0.5   0.5

c <- c("ayam","ayam", "udang","udang","ikan")
factor(c)

## [1] ayam  ayam  udang udang ikan 
## Levels: ayam ikan udang

#barplot
barplot(table(a))

barplot(table(b)/length(b))