Menyimpan Data dalam Variabel (Fungsi c)

simpan = c(10, 20, 40, 15, 40)
simpan
## [1] 10 20 40 15 40

Mengakses Nilai Data dalam Variabel secara Individual

simpan[3]
## [1] 40
simpan[4]
## [1] 15
simpan[c(1,3,4)]
## [1] 10 40 15
simpan[2:4]
## [1] 20 40 15

Mengubah Nilai Data dalam Variabel

simpan = c(10, 20, 40, 15, 40)
simpan[3]=100 
simpan[4]=10000 
simpan
## [1]    10    20   100 10000    40

Menghapus Nilai Data dalam Variabel

NILAI=c(10, 40, 45, 30, 80)
NILAI
## [1] 10 40 45 30 80
NILAI=NILAI[-3] 
NILAI
## [1] 10 40 30 80
NILAI=NILAI[-4]
NILAI
## [1] 10 40 30
NILAI=NILAI[c(-1,-3)]
NILAI
## [1] 40

Penggunaan Operator > (Lebih Besar Dari)

NILAI=c(100, 95, 70, 80, 25, 60, 80, 60, 55, 90)
NILAI
##  [1] 100  95  70  80  25  60  80  60  55  90
NILAI[NILAI>80]
## [1] 100  95  90

Penggunaan Operator < (Lebih Kecil Dari)

NILAI=c(100, 95, 70, 80, 25, 60, 80, 60, 55, 90)
NILAI
##  [1] 100  95  70  80  25  60  80  60  55  90
NILAI[NILAI<70]
## [1] 25 60 60 55

Penggunaan Operator & (Dan)

NILAI=c(100, 95, 70, 80, 25, 60, 80, 60, 55, 90)
NILAI
##  [1] 100  95  70  80  25  60  80  60  55  90
NILAI[NILAI>60&NILAI<80]
## [1] 70

Penggunaan Operator | (Atau)

NILAI=c(100, 95, 70, 80, 25, 60, 80, 60, 55, 90)
NILAI
##  [1] 100  95  70  80  25  60  80  60  55  90
NILAI[NILAI>80 | NILAI<30]
## [1] 100  95  25  90

Lebih Lanjut Penggunaan Operator < (Lebih Kecil Dari)

NILAI=c(100, 95, 70, 80, 25, 60, 80, 60, 55, 90)
NILAI
##  [1] 100  95  70  80  25  60  80  60  55  90
NILAI=NILAI[NILAI<75]
NILAI
## [1] 70 25 60 60 55

Lebih Lanjut Penggunaan Operator > (Lebih Besar Dari)

NILAI=c(100, 95, 70, 80, 25, 60, 80, 60, 55, 90)
NILAI
##  [1] 100  95  70  80  25  60  80  60  55  90
NILAI=NILAI[NILAI>90]
NILAI
## [1] 100  95

Contoh Sederhana Penggunaan dari Bahasa Pemrograman R

fungsi=function(x) 
{ 
 for(i in 1 : length(x)) 
    { 
  if(x[i]<65) 
     { 
   x[i]=x[i]+10; 
     } 
   print(x[i]) 
    } 
} 
A=c(100, 95, 70, 80, 25, 60, 80, 60, 55, 90) 
fungsi(A)
## [1] 100
## [1] 95
## [1] 70
## [1] 80
## [1] 35
## [1] 70
## [1] 80
## [1] 70
## [1] 65
## [1] 90

Jenis Data R

mode(1000)
## [1] "numeric"
simpan=c(1000)
mode(simpan)
## [1] "numeric"
mode("HALO")
## [1] "character"
simpan=c("HALO")
mode(simpan)
## [1] "character"
d=(F)
d
## [1] FALSE
a=c(T)
a
## [1] TRUE
mode(d)
## [1] "logical"
mode(a)
## [1] "logical"
kuadrat=function(x) 
{ 
 print(x*x); 
} 
A=c(4) 
kuadrat(A) 
## [1] 16
mode(kuadrat)
## [1] "function"

Operator Penjumlahan +, Pengurangan -, Perkalian *, Pembagian /, Pangkat ^, Sisa %%

A=c(1,2,3)
B=c(4,5,6)
C=A+B
C
## [1] 5 7 9
A=c(1,2,3)
B=2+A
B
## [1] 3 4 5
A=c(2,4,6)
B=c(1,3,5)
B-A
## [1] -1 -1 -1
A=c(4,8,12)
A*0.5
## [1] 2 4 6
A=c(4,8,12)
B=c(2,2,2)
A/B
## [1] 2 4 6
A=c(3,6,1)
B=c(2,2,0)
A^B
## [1]  9 36  1
A=c(5,2,7)
B=c(3,2,6)
C=A%%B
C
## [1] 2 0 1

Fungsi length

A=c(100,70,80,55,80,70,80) 
length(A) 
## [1] 7

Fungsi sort

A=c(70,80,50,25,100,60) 
sort(A) 
## [1]  25  50  60  70  80 100

Fungsi diff

A=c(100,50,70,80,60) 
diff(A)
## [1] -50  20  10 -20

Fungsi sum

A=c(50,60,70,80) 
sum(A)
## [1] 260

Fungsi sqrt

a=sqrt(81)
a
## [1] 9
b=sqrt(a)
b
## [1] 3

Fungsi max dan min

A=c(10,25,90,75,95,57) 
max(A)
## [1] 95
min(A)
## [1] 10

Fungsi exp

exp(1)
## [1] 2.718282
exp(2)
## [1] 7.389056

Fungsi pi atau 𝝅

pi
## [1] 3.141593

Fungsi options

options(digits=3) 
pi
## [1] 3.14
options(digits=10) 
pi
## [1] 3.141592654

Fungsi seq

seq(from=1, to=10)
##  [1]  1  2  3  4  5  6  7  8  9 10
seq(from=2, by=0.5, length.out=4)
## [1] 2.0 2.5 3.0 3.5
panggil=function(x,y,z) 
{ 
  a=x; 
  print(a); 
  for(i in x : z) 
    { 
      a=a+y; 
      if(a>z) 
        { 
          break; 
        } 
  print(a); 
    } 
} 
panggil(2,3,30)
## [1] 2
## [1] 5
## [1] 8
## [1] 11
## [1] 14
## [1] 17
## [1] 20
## [1] 23
## [1] 26
## [1] 29

Fungsi table

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
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
hasil=c("ya","tidak","ya","ya","ya","ya","tidak","ya","tidak","ya") 
table(hasil)
## hasil
## tidak    ya 
##     3     7
table(hasil)/length(hasil)
## hasil
## tidak    ya 
##   0.3   0.7

Fungsi factor

A=c("ikan","ikan","udang","ikan","udang","ikan","ikan","udang") 
factor(A)
## [1] ikan  ikan  udang ikan  udang ikan  ikan  udang
## Levels: ikan udang
A=c("sarjana","diploma","sarjana","pengangguran","sarjana","diploma","diploma","pengangguran") 
factor(A)
## [1] sarjana      diploma      sarjana      pengangguran sarjana     
## [6] diploma      diploma      pengangguran
## Levels: diploma pengangguran sarjana

Fungsi barplot

A=c(10,10,10,10,20,20,30,30,30,30,30,30)
barplot(table(A))

barplot(table(A)/length(A))

# Fungsi plot

A=c(10,10,10,10,10,20,20,20,30,30,40) 
table(A)
## A
## 10 20 30 40 
##  5  3  2  1
nilai=c(10,20,30,40) 
frekuensi = c(5,3,2,1) 
plot(nilai,frekuensi)

A=c(10,10,10,10,10,20,20,20,30,30,40) 
plot(table(A))