Matlab-Iterating for loop with file string name

Question

I am trying to read in 40 files to be executed by a certain function later in the code. There are 40 files named 'Part_#_D1', the # is a number between 1 and 40. How can I read them in here and iterate the function on it? I was trying to use the %d thing and use the i but it keeps failing. How am I using this incorrectly?

for i = 1:40
    img_part = imread('[/Users/cocosci/Desktop/H_All/,'Part_%d','/','Part_%d_D1.jpeg']'),i;
end

Suever · Accepted Answer · 2017-01-15 22:54:25Z

4

You're just performing the horizontal concatenation of strings which doesn't suppoert any format specifiers. You can only use the %d format specifier (or any format specifier) when using either sprintf or fprintf. In your case, you'll want to use sprintf to generate a string.

for k = 1:40
    filename = sprintf('/Users/cocosci/Desktop/H_All/Part_%d/Part_%d_D1.jpeg', k, k);

    % Store each image in a cell array element
    img_part{k} = imread(filename);
end

And then you can access a particular image with

% Access the third image
img_part{3}

Also, consider using k as your loop index rather than i since i is a built-in for 0 + 1i.

edited Jan 15, 2017 at 22:54

answered Jan 15, 2017 at 22:38

Suever

65.6k14 gold badges91 silver badges104 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

mathpun Over a year ago

Thanks!! Do I put that under the for loop, how do I get it to understand that i is 1-40?

Suever Over a year ago

@user3290443 I just updated it to include the explicit loop. Also, it will generate a new filename for each k value since that is inside of the loop.

mathpun Over a year ago

Do I need just 1 k or 2? Since I used %d twice?

Suever Over a year ago

@user3290443 Oops you need two! I didn't see that second one when I posted initially. Updated now

mathpun Over a year ago

(Yay, teamwork!) Ok cool, and then does it store all these in k? How can I see the values inside?

|

Collectives™ on Stack Overflow

Matlab-Iterating for loop with file string name

1 Answer 1

7 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Related