How can I display multiple images in one figure window using for loop?

Is there a way for me to be able to read/display 100 images (0001.png - 0100.png) without having to type them all manually like below? All 100 images are in a folder if that helps (C:\Users\pittsl\Desktop\Matlab\train\cup).

files = {'0001.png', '0002.png','0003.png','0004.png','0005.png',};
for K = 1 : 5
  this_image = imread(files{K});
  ax = subplot(1, 5, K);
  imshow(this_image, 'Parent', ax);
end

Answer 1

[Adam Danz]

% Inputs: folder and file extension
% Will plot all files with the chosen extension in the chosen folder 
folder = 'C:\Users\pittsl\Desktop\Matlab\train\cup';
ext = 'png'; %extension, no dot

% Get list of all files
content = dir(folder);
allfiles = {content.name};
isExt = endsWith(allfiles,['.',ext],'IgnoreCase',true);  % req. r2016b or later https://www.mathworks.com/help/matlab/ref/endswith.html
files = allfiles(isExt);

% Determine subplot layout
nImages = numel(files);
dimN = ceil(sqrt(nImages));
dimM = ceil(nImages/dimN);
nrows = min(dimN, dimM);
ncols = max(dimN, dimM);

% Plot them
for K = 1:nImages
    this_image = imread(fullfile(folder,files{K}));
    ax = subplot(nrows,ncols, K);
    imshow(this_image, 'Parent', ax);
end

For MATLAB releases prior to R2016b, replace the endsWith function with this,

isExt = ~cellfun('isempty',regexpi(allfiles,['.',ext,'$']));

Alternative

To show thumbnail images of all image files within a folder or images with specified extensions, see showImageThumbnails from the File Exchange. Image tiles will be numbered and a table is returned that defines the path to each tile.

folder = 'C:\Users\pittsl\Desktop\Matlab\train\cup';
ext = '.png'; % include dot
showImageThumbnails(folder, ext)

[Stephen23]

It would be simpler just to specify the dir file name with wildcard and extension:

content = dir(fullfile(folder,'*.png'));

[Lauren Pitts]

Thank you, Adam. This worked perfectly!

[Adam Danz]

Glad I could chip in!

[Elif]

How can I write image names?

[Adam Danz]

Use title() or text().

[Elif]

Thank you.

[Baba Mohammed]

Thanks

[image-pro]

Showing error

Undefined function 'endsWith' for input arguments of type 'cell'.

Error in Untitled9 (line 10)

isExt = endsWith(allfiles,['.',ext],'IgnoreCase',true); % req. r2016b or later

https://www.mathworks.com/help/matlab/ref/endswith.html

[Adam Danz]

@image-pro, what matlab release are you using?

[image-pro]

matlab 2015

[Adam Danz]

Check out the comment next to the endsWith line. This solution requires MATLAB R2016b or later. Always take a moment to view the code when you're copying/pasting it.

I've updated my answer to include an alternative for pre-2016b. See the bottom of the answer.

[image-pro]

thank you

[Stephen23]

Simpler:

folder = 'C:\Users\pittsl\Desktop\Matlab\train\cup';
ext = 'png'; %extension, no dot
% Get list of all files
content = dir(fullfile(folder,sprintf('*.%s',ext)));
files = {content.name};
.. etc.