How to pull an image by its name

Hi all. I'm very new to the MATLAB, and I wonder if you could help me with my issue.

There are 2 folders. folder 1 - 100 images - 3 conditions folder 2 - 100 images - 3 conditions

Images are named from 1 to 100 with additional letters depending on the condition, for example 1up, 2up, 3in, 4bu, 5up, 6in etc.

Loop goes simply from 1-100 and then moves to the next folder and displays another 100 images.

So I wonder, how to call the image not by the number but by the condition? (by the text that is next to the number).

Here is the code I have:

expinfo.nBlock = 2;                                      % number of blocks 
expinfo.nrPic = 100;                                     % number of trials per block

for  blockNumber = 1:expinfo.nBlock
              dirName = ['./Stimuli/Block',num2str(blockNumber),'/'];
              file_list = dir([dirName,'*.jpg']);
              im = cell(length(file_list),1);                         
                            for file = 1:length(file_list)
                               im{file} = imread([dirName,file_list(file).name]);
                            end

                              for j = 1:length(im)
                                  im_tex(j) = Screen('MakeTexture', winPtr, im{j});
                              end
  wf = 0;                                                  % resets the counter for pictures 
  response = -1;   
  while response == -1
      wf = wf +1;

          if wf > expinfo.nrPic
            response = 1;
                                  if response == 1
                                      break;
                                  end
         end
  end

What I am trying essentially do is to call markers by using the condition name. For example, before I have used the key button to do so:

                                           if keyIsDown
                                              if keyCode(space) && ~keyCode(rightKey) && ~keyCode(leftKey)           
                                                    mrk2 = wf+100;
                                                    outlet.push_sample(mrk2);   
                                                    disp(['Now sending: ' int2str(mrk2)])
                                                 end
                                              end

However, in this script there is no response from participants so I have to associate the markers with something else, thus I thought I could use the condition name that is next to the number. If I could achieve that I could get a fully working script without disturbing the loop. Any thoughts? Many thanks!

Answer 1

[Cam Salzberger]

Once you have the file name, you could use some parsing to remove the number and extension and just get the condition text. Then you can use that text for whatever you want (it's not clear to me what you mean by "call"). Here's an example using regular expressions:

fName = '1up.jpg';
% Ignore digits at the start, accept anything but a period as a condition, and match any extension
fCond = regexp(fName, '\d+([^\.])+\.', 'tokens');
fCond = fCond{1}{1};

If you want to do something with key presses, you'd probably have better luck adding a KeyPressFcn or WindowKeyPressFcn callback to the figure, and react there. But it can only handle single key strokes, not entering a name.

If you want users to enter a full name and do something then, probably better off giving them an edit uicontrol to type in, and create a callback for that.

-Cam