[R] Integration + Normal Distribution + Directory Browsing Processing Questions

Nils Hoeller mail at nhoeller.de
Sun Jan 21 20:27:35 CET 2007

Hi everyone,

I am new to R, but it's really great and helped me a lot!

But now I have 2 questions. It would be great, if someone can help me:

1. I want to integrate a normal distribution, given a median and sd.
The integrate function works great BUT the first argument has to be a 

so I do integrate(dnorm,0,1) and it works with standard m. and sd.

But I have the m and sd given.

So for fixed m and sd I work around with a new function mynorm

mynorm <- function(n) {
    ret <- dnorm(n,0.6,0.15)

for example.

BUT what can I do for dynamic m and sd?
I want something like integrate(dnorm(,0.6,0.15),0,1), with the first 
dnorm parameter open for the
integration but fixed m and sd.

I hope you can help me.

2. I am working with textfiles with rows of measure data.
read.table("file") works fine.

Now I want R to read.table all files within a given directory and 
process them one by the other.

for(all files in dir xy) {
x <- read.table(nextfile)
process x

Is that possible with R? I hope so. Can anyone give me a link to examples.

Thanks for your help


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