selecting multiple files from folder directly

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shanmukh
shanmukh 2013-5-14
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

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回答（4 个）

David Sanchez
David Sanchez 2013-5-14
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
David Sanchez
David Sanchez 2013-5-14
adapt the line to your need:
files_wanted = dir('a1*1*.txt');
  2 个评论
shanmukh
shanmukh 2013-5-14
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 2013-5-14
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 2013-5-14
variant
q = dir('*.txt');
n = regexp({q.name},'^a1.*[1-3]_a.*','match');
out = n(~cellfun('isempty',n));
David Sanchez
David Sanchez 2013-5-14
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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