Objects of chunks not showing in environment

[DrunkenPhD]

Hi I got this chunks and I need the first one results to be used for the second one and so on

None of the objects created are shown in environment

<<ch1, fig.width=3, fig.height=2.5, out.width='.49\\linewidth', fig.show='hold',size='scriptsize',message=FALSE>>=

set.seed(1001)

N <- 100

x <- rnorm(N, mean = 3, sd = 2)

mean(x)

sd(x)

@

<<ch2, fig.width=3, fig.height=2.5, out.width='.49\\linewidth', fig.show='hold',size='scriptsize',message=FALSE>>=

LL<- function(mu, sigma){R = dnorm(x, mu, sigma)- sum(log(R))}

@

<<ch3, fig.width=3, fig.height=2.5, out.width='.49\\linewidth', fig.show='hold',size='normalsize',message=FALSE>>=

library(stats4)

mle(LL, start = list(mu = 1, sigma=1))

@

Please help