How can I plot two cumulative distributions curve as line type in same plot

Question

I want to plot cumulative distributions curve for Weibull distribution over empirical cumulative distribution curve.

I have tried with this several times but it does not serve the way I want. Here is the command:

x<-(SIZEDIST$AVG.µm.)
x
plot(x,pweibull(x,shape=1.120662,scale=18.496778),type="l",col=4)
plot(ecdf(x),add=TRUE)

Answer 1

Use lines instead of plot

plot(x,pweibull(x,shape=1.120662,scale=18.496778),type="l",col=4)
lines(ecdf(x),col='red')

Answer 2

Like this?

set.seed(1)  # for reproducibility
# 1000 random samples from the Weibull dist
X <-rweibull(1000,shape=1.120662,scale=18.496778)
# z covers the range in X
z <- seq(min(x),max(x),length=100)
plot(z,pweibull(z,shape=1.120662,scale=18.496778),type="l",col=4, ylab="CDF")
plot(ecdf(x),add=TRUE)