Problems with Indexing of cell array

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PR 2018-5-26

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https://ww2.mathworks.cn/matlabcentral/answers/402702-problems-with-indexing-of-cell-array

编辑： Ameer Hamza 2018-5-27

Hi guys!

The problem I have is the following: I have a dictionary with names and with one picture. I create a randomized sequence for my pictures. Now I want to display (via Psychtoolbox) the respective Name Cues for the image, but in randomized order. Hopefully my code snippet does show you what I mean:

 nameCues1 = {'Lisa','Anna', 'Sarah', 'Nina', 'resized_1.jpg' };
nameCues2 = {'Emma', 'Lena', 'Gabi', 'Steffi', 'resized_2.jpg' };
nameCues3 = {'Tanja', 'Luisa', 'Jana', 'Nicole', 'resized_3.jpg' };
nameCues4 = {'Clara', 'Tina', 'Katja', 'Susi', 'resized_4.jpg' };

I have loaded them into a cell array:

nameCuesAll = {nameCues1,nameCues2, nameCues3}

Now I create a randomized sequence:

 randSeq3 = nameCuesAll(randperm(size(nameCuesAll,2)));
 %%Loop for Rating Phase
% Reads facial stimuli for "Explicit Recognition Phase" 
for i = 1:numel(nameCuesAll)
    pics3{i} = imread(randSeq3{i}{1,5});
    ind{i}=randperm(numel(randSeq3{i}));
     ind{i}=randSeq3{i}{ind}; %this doesn't work yet!
end

Then I prompt in on the Screen via the function of Psychtoolbox:

 for j = 1:4
  %%here I leave out some unnecessary functions of Psychtoolbox 
      DrawFormattedText(window,ind{i}(j), 'center', 'center', white, [], [], [], [], [], rect);
     end

I put in some hard hours, but didn't come close to a sufficient solution. I would be very glad if someone could help me out here.

Thanks so much!

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PR 2018-5-27

编辑：PR 2018-5-27

在 MATLAB Online 中打开

will produce something like 2,3,1,4,5. What do you expect the value of ind{1} after

Yeah, the last one is with wrong syntax, thanks. I wanted to use this vector (2,3,1,4,5 -for example) as input for the function:

   DrawFormattedText(window,ind{i}(j), 'center', 'center', white, [], [], [], [], [], rect);

so that this function prompts: a) the picture (of, for example, names1) b) the 4 names in randomized order (of, for example, names1).

But that doesn't work, MATLAB throws several errors, most commonly that subsscripting is not allowed for cells. I have no idea how to solve that unfortunately which is why I asked here...

Best, PR