Iteration through a list in R

Hello :)
I'm just starting out with R and would appreciate your help with a couple
of problems I am running into.

You do need to work through the examples in "Introduction to R"

I have used Sys.glob to get a list of all filenames having a particular
file extension (in my case, *.txt)

When posting to rhelp you should offer code as well as a description.

I would now like to use this list in the following manner: I would like to
use each filename from the list and open that file into a tab separated
matrix and proceed.

?read.delim

"Matrix" is sometimes used as a generic English word describing a regular arrangement of data. When discussing the R language, you should use it only when talking about a specific sort of data-object which will return TRUE for: is.matrix(object). And then depending on whether you actually want a matrix or will be satisfied by the data-frame object that read.delim would have returned, you may or may not need:

?data.matrix

How can I go about iterating through each filename in the list and then
opening each of the files?

lapply( fil_list, read.delim)

I believe as.matrix can be used to open the txt file as a table, is that
correct?

No. Please read the help page for `as.matrix` more carefully. It does not take a file or connection argument.

I know these are beginner queries but I would love your help. Thank you in
advance :)

David Winsemius
Alameda, CA, USA