selecting multiple files from folder directly

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i have a folder DATA in which i have 3 file with names
a1_14.05.2013_1_a.txt
a1_15.05.2013_2_a.txt
a1_14.05.2013_3_a.txt
i need to select folder DATA to grab 3 different files starting with a1,1 and a1,2 and a1,3 irrespective of the dates.
please let me know how to do this

Answers (4)

David Sanchez
David Sanchez on 14 May 2013
Hello, this might be of help:
% this creates a structure with information on every
% file whose name starts with "a1_" and has ".txt" extension.
files_wanted = dir('a1_*.txt');
files_wanted(1).name % presents the name of first file agreeing your search criteria
  1 Comment
shanmukh
shanmukh on 14 May 2013
Edited: shanmukh on 14 May 2013
i need file starting with a1 and having 1 in the middle

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David Sanchez
David Sanchez on 14 May 2013
adapt the line to your need:
files_wanted = dir('a1*1*.txt');
  2 Comments
shanmukh
shanmukh on 14 May 2013
d = uigetdir(pwd, 'Select a folder');
files_wanted = dir('a1*1*.txt');
fid1 = fopen((files_wanted), 'r');
c2 = textscan(files_wanted,'%s%f%f%f%f%f%f','delimiter', ';','HeaderLines',1);
i am trying to get data from the file but i have an error message '
Error using fopen
First input must be a file name of type char, or a file identifier of type double.'
Jan
Jan on 14 May 2013
dir() replies a struct array, as the documentation explains exhaustively. You want the name of the file as string:
[fName, fPath] = uigetdir(pwd, 'Select a folder');
files_wanted = dir(fullfile(fPath, 'a1*1*.txt'));
FileName = fullfile(fPath, files_wanted(1).name);
fid1 = fopen(FileName, 'r');

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Andrei Bobrov
Andrei Bobrov on 14 May 2013
variant
q = dir('*.txt');
n = regexp({q.name},'^a1.*[1-3]_a.*','match');
out = n(~cellfun('isempty',n));

David Sanchez
David Sanchez on 14 May 2013
Firstly, if you use uigetdir, there is no need for files_wanted = dir('a1*1*.txt'). Use one or the other method to open the files.
You can also use
uigetfile('a1*.txt')
to look for your files and choose them one at a time. Use it recursively if you want to.
In your code, you are passing and structure to fopen function, which can not be performed.

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