MATLAB: Dlmread filename not a character vector

dlmreadfor loop

Hello, I am having problems using dlm read within a for loop. I would like to define a directory my files are in, the basic name of my files, a sequence of numbers at the end of my filename, and the file extension. An example of the filenames is as follows.
folder1/folder2/folder3/filename_000.txt
folder1/folder2/folder3/filename_001.txt
folder1/folder2/folder3/filename_002.txt
This continues up to n files. I would then like to read each file and take out specific data, hence the dlmread function.
What I have is as follows:
 file_directory = 'folder1/folder2/folder3/';
 file_prefix = 'filename_';
 %My numbers 000, 001, 002, 003, etc. are all contained within an array called:  A
 file_suffix = '.txt';
 for i=1:n   %n for the number of files I want to load
     filename = [file_directory file_prefix A(i) file_suffix];
     temp=dlmread(filename ,'', [17 0 3664 1]);
 end
The code runs until temp=dlmread… wherein it gets an error of, "Filename must be a character vector."
Any way on how to fix this?

Best Answer

I figured out the problem. The working for loop is as follows:
 for j=0:files
    filename = [file_folder file_prefix A{1,j+1} file_suffix];
    temp=dlmread(filename,'', [17 0 3664 1]);
 end
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