R: Matematika Dasar

Contoh operasi matematika

2 ^ 2

2 * 2

2 / 2

2 + 2

2 - 2

4 * 3 ^ 3

vector -4 s/d 3

-4:3

abs remainder

absolute

abs(-4:3)

remainder

(-4:3) %% 2

(-4:3) %/% 3

sign

sign(-4:3)

round

round(7/18,2)

7/118

options(digits=2)
7/118

floor(0.39)

ceiling(0.39)

summary functions

sum(1:3)
prod(c(3,5,7))
min(c(1,6,-14,-154,0))
max(c(1,6,-14,-154,0))
range(c(1,6,-14,-154,0))

any(c(1,6,-14,-154,0)<0)
which(c(1,6,-14,-154,0)<0)
all(c(1,6,-14,-154,0)<0) # all checks if criteria is met by each element

Complex

# Plot of Characteristic Function of a U(-1,1) Random Variable
a <- -1; b <- 1
t <- seq(-20,20,.1)
chu <- (exp(1i*t*b)-exp(1i*t*a))/(1i*t*(b-a))
plot(t,chu,"l",ylab=(expression(varphi(t))),main="Characteristic Function of Uniform Distribution [-1, 1]")

Trigonometry

sin(pi/2)

tan(pi/4)

cos(pi)

Pranala Menarik

• R