per-KS3-2.R

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

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

## [1] 7

# sort / mengurutkan
sort(nilai)# a-z

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

sort(nilai, decreasing = TRUE) #z-a

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

# sum
sum(nilai)

## [1] 556

#mean
mean(nilai)

## [1] 79.42857

# min/ nilai minimum
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)

## a
## 10 30 40 60 70 80 90 
##  5  2  2  2  2  1  2

pa <- table(a)/length(a)

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

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

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

# barplot
barplot(table(a))

barplot(pa)

barplot(pb)