How to read/write files inside a loop?

if true
  % code
end
I am trying to read/write files inside a loop but I am not certain how it is done.
For example, I have a set of files (Sec1.dat, Sec2.dat ..... Sec30.dat). I want to create code where I can index the file name and process the data. My idea is :
n = 30
for i = 1 : n-1
  Amat = dlmread ('Sec(i).dat', ' ' )
  Bmat = dlmread ('Sec(i+1).dat', ' ')
  Operation 1
  Operation 2
  .
  .
  .
  dlmwrite ('X(i).dat',X,' ')
end

I am facing problems with the indexing of the file names. Any help will be greatly appreciated.

Thank you

Answer 1

[Razvan]

Use

sprintf('Sec%d.dat', i)

instead of 'Sec(i).dat'. So something like this

Amat = dlmread (sprintf('Sec%d.dat', i), ' ' );
Bmat = dlmread (sprintf('Sec%d.dat', i+1), ' ');

...

dlmwrite (sprintf('X%d.dat',i),X,' ')

Answer 2

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F