counting number of occurrences of every possible substring in multiple files

I am trying to write a program that reads multiple files and prints out the
number of occurrences of n-length byte sequences across these files. the
value of n must be specified on the command-line.

Since I'll be dealing with binary files, I want the ASCII codes of the
characters printed out.

e.g. for n=2 and the following 3 files, contents shown as integers,

f1 = {33, 84, 55}, f2 = {84, 55, 12}, f3 = {33, 84, 55}

I want output like this:
3    84 55
2    33 84

I'll be dealing with files up to about one megabyte in size. Efficiency is
not critical, and it does not matter, say, if a length-2 sequence is a
substring of a length-3, or a more frequently occurring sequence. Values of
n will not go above 10.

C3 <> wrote:
> I am trying to write a program that reads multiple files and prints out th
e
> number of occurrences of n-length byte sequences across these files. the
> value of n must be specified on the command-line.
>
> Since I'll be dealing with binary files,


perldoc -f binmode


> I want the ASCII codes of the
> characters printed out.


Huh?

If it is a text file, then it contains ASCII codes.

If it is a binary file, then it may contain some other encoding.

Anyway,

perldoc -f chr
perldoc -f ord


> e.g. for n=2 and the following 3 files, contents shown as integers,
>
> f1 = {33, 84, 55}, f2 = {84, 55, 12}, f3 = {33, 84, 55}
>
> I want output like this:
> 3    84 55
> 2    33 84
>
> I'll be dealing with files up to about one megabyte in size. Efficiency is
> not critical, and it does not matter, say, if a length-2 sequence is a
> substring of a length-3, or a more frequently occurring sequence. Values o
f
> n will not go above 10.


Did you mean to ask a question?

What is it that you need help with?

Are you asking for someone to write a program to your specification
for you? It kind of sounds that way...


--
Tad McClellan                          SGML consulting
tadmc@augustmail.com                   Perl programming
Fort Worth, Texas

"C3" <_> wrote in message
news:415ac218$0$20582$afc38c87@news.optusnet.com.au...
> I am trying to write a program that reads multiple files and prints
out the
> number of occurrences of n-length byte sequences across these files.
the
> value of n must be specified on the command-line.
>
> Since I'll be dealing with binary files, I want the ASCII codes of the
> characters printed out.
>
> e.g. for n=2 and the following 3 files, contents shown as integers,
>
> f1 = {33, 84, 55}, f2 = {84, 55, 12}, f3 = {33, 84, 55}
>
> I want output like this:
> 3    84 55
> 2    33 84
>
> I'll be dealing with files up to about one megabyte in size.
Efficiency is
> not critical, and it does not matter, say, if a length-2 sequence is a
> substring of a length-3, or a more frequently occurring sequence.
Values of
> n will not go above 10.

Do you realize that no where in here did you ask a question?  What is it
you need help with?  What part are you stuck on?  What have you tried so
far, and how did your attempt fail to work correctly?

Paul Lalli