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R code for simple Monte Carlo estimation of pi.
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| require (plotrix) | |
| require (grid) | |
| plot(c(-1, 1), c(-1,1), xlab = "x", ylab="y", type = "n", asp=1) | |
| rect( -1, -1, 1, 1) | |
| draw.circle( 0, 0, 1 ) | |
| N <- 150 | |
| x <- runif(N, min=-1, max=1) | |
| y <- runif(N, min=-1, max=1) | |
| points (x, y, col="red", pch=19) | |
| PiEst = 0 | |
| for (i in 1:N){ | |
| if ((x[i]^2+y[i]^2)<1) | |
| PiEst = PiEst+1 | |
| } | |
| PiEst = 4*PiEst/N | |
| PiEst | |
| dev.off() |
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