# [R] Plotting several functions in the same display (again)

Julio Sergio juliosergio at gmail.com
Thu Apr 4 17:38:03 CEST 2013

```To superimpose two functions plots in the same page. The functions L0
and L1, as defined below, I use the following code:

# An accumulative normal distribution function with
# several parametres
f0 <- function(mu, xm, ds, n) {
1 - pnorm((xm-mu)/(ds/sqrt(n)))
}

f1 <- function(mu,n) f0(mu, 386.8, 48, n)

# Two functions with just the parameter mu
L0 <- function(mu) f1(mu, 36)
L1 <- function(mu) f1(mu,100)
plot(L0,ylim=c(0,1),xlim=c(360,420))

However, I'm puzzled with a problem in the same line: When I passed a
"function producer" to plot, again it worked well; however it didn't work in
the same way when trying to use this same argument in curve. See what I'm

# A particular normal distribution function:
dn8 <- function(z,m) dnorm(z,m,8) #  norm dist with sd=8

# A function that produces functions:
#   returns a function such that given a mean(i) depends only
#   on z
fi <- function(i) function(z) dn8(z,i)

plot(fi(370),xlim=c(360,420)) # Works well!

# However, if I put it in this way, surprisingly, it works!
ff <- fi(380)