Using Compound to match image/audio/written words

I'm using Psychtoolbox to built an experiment using stimuli from different modalities, grouped in different array( audio, image and written words). The item in the differents modalities has to be compound, cause 5 item will be inittialy presented and later recognized within a mixed sequence in all modalities:

I did this code

ImageList={imagelist.jpg}
wordList={words}
soundlist={soundlist.wav};

correctness=[1 1 1 1 1 2 2 2 2 2 2  2 2 2 2 2 2 2 2 2 2 2  2 2 2 2 2  2 2 2 2 2 2 2 2 2 2 2];

for k=1:38
  compound{k,1}=wordList{k};
  compound{k,2}=MyImages{k}; 
  compound{k,3}=word{k}; 

end

randcompound= Shuffle(compound);
for k=1:38 
randcompound{k,4}=correctness(k);   
end

The compound works, but when I shuffle it in randcompound it mix everything.

Any suggestion?

[Walter Roberson]

Why not assign correctness before doing the Shuffle, so that it gets shuffled with everything else?

Answer 1

[Walter Roberson]

ImageList={imagelist.jpg}   %assumes imagelist is a struct array with field named 'jpg'
wordList={words}
soundlist={soundlist.wav};  %assumes soundlist is a struct array with field named 'wav'

Compound(:,1) = ImageList(:);
Compound(:,2) = wordList(:);
Compound(:,3) = soundlist(:);
Compound(:,4) = num2cell( correctness(:) );

ncomp = size(Compound, 1);
randidx = randperm(ncomp);

randcompound = compound(randidx, :);

[Laura Pizzato]

It works because it mantain compound even with randomization, but It obviously mark as correct (correctness=1) only the top 5 array's compounds, e.g ant.jpg, ant.wav ant, whereas I have to mark as correct the 5 item randomly selected by the array. How could I face that?

[Walter Roberson]

ImageList={imagelist.jpg}   %assumes imagelist is a struct array with field named 'jpg'
wordList={words}
soundlist={soundlist.wav};  %assumes soundlist is a struct array with field named 'wav'

Compound(:,1) = ImageList(:);
Compound(:,2) = wordList(:);
Compound(:,3) = soundlist(:);
ncomp = size(Compound, 1);
Compound(:,4) = num2cell( correctness(randperm(ncomp)) );

randidx = randperm(ncomp);
randcompound = compound(randidx, :);