R is an actively used programming language created in 1993.

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### Example code from the Hello World Collection:

```# Hello World in R
cat("Hello world\n")
```

### Example code from Linguist:

```hello <- function() {
print("hello, world!")
}
hello()
```

### Example code from Wikipedia:

```install.packages("caTools")  # install external package
library(caTools)           # external package providing write.gif function
jet.colors <- colorRampPalette(c("#00007F", "blue", "#007FFF", "cyan", "#7FFF7F",
"yellow", "#FF7F00", "red", "#7F0000"))
dx <- 400                  # define width
dy <- 400                  # define height
C <- complex( real=rep(seq(-2.2, 1.0, length.out=dx), each=dy ),
imag=rep(seq(-1.2, 1.2, length.out=dy), dx ) )
C <- matrix(C,dy,dx)       # reshape as square matrix of complex numbers
Z <- 0                     # initialize Z to zero
X <- array(0, c(dy,dx,20)) # initialize output 3D array
for (k in 1:20) {          # loop with 20 iterations
Z <- Z^2+C               # the central difference equation
X[,,k] <- exp(-abs(Z))   # capture results
}
write.gif(X, "Mandelbrot.gif", col=jet.colors, delay=100)```
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Last updated February 11th, 2019