How do I imread stimuli from a randomised array

I tried reading stimulus image into matlab matrix but get receiving error message saying the file does not exist. Here is my code:

files = dir('D:\picture\*.jpg'); %folder name is stimuli
trial = 0;
nTrial = 10;
for trial=1:nTrial
stimfilename=strcat('D:\picture\',char(tArray(trial,3)))  imdata=imread(char(stimfilename));
end

I ran the above code and it returns stimfilename as D:\picture\J123jpg. However, it vomits an error message

??? Error using ==> imread at 372
File "D:\picture\J123jpg" does not exist.

Please any help will be highly appreciated. Thanks in advance.

Tom

Answer 1

[Laura Proctor]

You may wish to try by simplifying the code a bit. Try the following lines to see if you still get the same error message.

files = dir('D:\picture\*.jpg'); %folder name is stimuli 
for trial=1:length(files)
  stimfilename=['D:\picture\',files(trial).name];
  imdata=imread(char(stimfilename)); 
end

[Tom Fredrick]

Thanks Laura. I'll try it out.

Cheers,

Tom

[Walter Roberson]

You shouldn't need the char() around stimfilename either.

[Tom Fredrick]

Hi Laura, I tried it but it still tells me the file does not exist.

[Laura Proctor]

The error message shows that the file name is J123jpg, but not J123.jpg as one might expect. Can you go into the directory D:\picture and just try imread('J123.jpg') to see if the image can be read without the other code? If that works, try the following lines:

files = dir('D:\picture\*.jpg');

stimfilename=['D:\picture\',files(1).name]

imdata = imread(stimfilename)

To see if it can read just the first file.

[Tom Fredrick]

Thanks Laura, it's now working. Thanks too Walter. I appreciate your advice.

Cheers,

Tom