How to iterate through several files

I have several data files, data0.txt, data1.txt, etc. that contain numbers separated by spaces. I would like to iterate through each of these files and run some calculations:

file_strs = {'D:\Data\data0.txt' 'D:\Data\data1.txt' 'D:\Data\data2.txt'};

for a = 1:length(file_strs)

T1=importdata(file_strs(a), ' ');

% Do some calculations

......

end;

However, when I try this, I get:

Error using importdata (line 137)

Unable to open file.

Error in test (line 20)

T1=importdata(file_strs(a), ' ');

What am I doing wrong?

Steve

[Ryan]

Are you sure that the data file name exists exactly as written in the exact location given? Is another program busy using the file?

[Yash]

why not convert them into excel?

Answer 1

[Image Analyst]

Did you use exist(filename, 'file') to check that it exists before you use it? Try that.

Also, whenever you're using cell arrays and something doesn't work try switching parentheses to braces () -> {}, or vice versa {} -> (). That's a good rule of thumb. Like T1=importdata(file_strs{a}, ' '); Try that also.