Sequentially load images and generates textures with corresponding names

Question

Yu Takahashi 2021-4-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/790244-sequentially-load-images-and-generates-textures-with-corresponding-names

评论： Yu Takahashi 2021-4-2

Dear community members

My plan is to present images that is named sequentially (i.e., A_01.jpg, A_02.jpg...) on the screen using psychtoolbox functions.

I was stock at the very first step of generating the corresponding textures using the images that are all systematically named A_X.jpg. (X = 1:40) .

( p.s. all images were stored in the same folder)

The script currently looks something like this: (obviously this is very ineffecient)

    imageA01 = imread('A_01.jpg,'); % read the image
    A01_texture = Screen('Maketexture', windowPtr,imageA01); % generate and neme the texture
    % Screen('Maketexture', windowPtr,imageA02) is a psychtoolbox function
    % that generate textures that could be "flipped"(i.e., presented on
    % the screen) upon screen refreshes
    
    imageA02 = imread('A_02.jpg,'); 
    A02_texture = Screen('Maketexture', windowPtr,imageA02);
    imageA03 = imread('A_03.jpg,'); 
    A03_texture = Screen('Maketexture', windowPtr,imageA03);
    
    ...
    imageA40 = imread('A_40.jpg,'); 
    A40_texture = Screen('Maketexture', windowPtr,imageA40);

I've tried to simplify this using a for loop, but faild to dynamically create and name the individual textures.

Also saw this:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

which explicitely stated that we should NOT dynamically name variables, so I was't sure what to do.

Any help or comment is appreciated, thanks in advance.

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Answer 1

David Hill 2021-4-1

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/790244-sequentially-load-images-and-generates-textures-with-corresponding-names#answer_664714

在 MATLAB Online 中打开

Why not use cell array?

for k=1:40
  s=num2str(k);
  if length(s)==1
     s=['0',s];
  end
  texture{k}=Screen('Maketexture', windowPtr,imread(sprintf('A_%s.jpg',s));
end

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Yu Takahashi 2021-4-2

在 MATLAB Online 中打开

for k=1:40
  s=num2str(k);
  if length(s)==1
     s=['0',s];
  end
  texture{k}=Screen('Maketexture', windowPtr,imread(sprintf('A_%s.jpg',s)));
                                 % one missing parentheses at the very end                          
end