[R] Plotting probability density and cumulative distribution function

[chrisr34000]

Hi!

I want to plot the probability density function and the cumulative
distribution function for the gamma, lognormal, exponential and Pareto
distribution. I want to vary the parameters and and have a plot with 2-3
different parameters in the same figure. It should look like this (example
weibull distribution):

http://en.wikipedia.org/wiki/File:Weibull_PDF.svg

library(Cairo)
CairoFonts(regular="DejaVu Sans:style=Regular")
CairoSVG("Weibull PDF.svg")
par(mar=c(3, 3, 1, 1))
x <- seq(0, 2.5, length.out=1000)
plot(x, dweibull(x, .5), type="l", col="blue", xlab="", ylab="", xlim=c(0,
2.5), ylim=c(0, 2.5), xaxs="i", yaxs="i")
lines(x, dweibull(x, 1), type="l", col="red")
lines(x, dweibull(x, 1.5), type="l", col="magenta")
lines(x, dweibull(x, 5), type="l", col="green")
legend("topright", legend=paste("\u03bb = 1, k =", c(.5, 1, 1.5, 5)), lwd=1,
col=c("blue", "red", "magenta", "green"))
dev.off()

and

http://en.wikipedia.org/wiki/File:Weibull_CDF.svg

library(Cairo)
CairoFonts(regular="DejaVu Sans:style=Regular")
CairoSVG("Weibull CDF.svg")
par(mar=c(3, 3, 1, 1))
x <- seq(0, 2.5, length.out=1000)
plot(x, pweibull(x, .5), type="l", col="blue", xlab="", ylab="", xlim=c(0,
2.5), ylim=c(0, 1), xaxs="i", yaxs="i")
lines(x, pweibull(x, 1), type="l", col="red")
lines(x, pweibull(x, 1.5), type="l", col="magenta")
lines(x, pweibull(x, 5), type="l", col="green")
legend("bottomright", legend=paste("\u03bb = 1, k =", c(.5, 1, 1.5, 5)),
lwd=1, col=c("blue", "red", "magenta", "green"))
dev.off()

How do I adapt the syntax to use it for the other distributions?



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