Choosing specific columns and rows

Hi everyone,

Is there anyone can help on the following matter :

I have a folder contains mualiple matfiles C1,C2,C3,C4.....C22. each mat files represent 30x30 matrix, named by (data).

1- I want to load all these files using for loop .

3- I want to pick up 8 rows and 8 columns from the 30x30 matrix from every matfile.

2- then i want to save them as y1, y2, y3,..... till y22.

I have tried this code to do the job, but the output was the same matrix for all the data

%%

N = 22;

D = 'path to the folder the files are saved';

for k = 1:N

F = fullfile(D,sprintf('C%d.mat',k));

S = load(F);

Y = data ([5:7 19 22 24:26],[5:7 19 22 24:26]);

F = fullfile(D,sprintf('Y%d.mat',k));

save(F,'Y')

end

[Stephen23]

Note that

D = 'path to the folder where the files are saved';

is unlikely to be the path to a valid folder. You should change that string so that it refers to a valid folder (just as the string states).

[Abdulhakim Alezzi]

Dear Stephen,

Actully I did not want to show my folder's name here . but in the actual code i am using the right folder name.

Answer 1

[Stephen23]

Y = S.data(...);
    ^^ you need to access the field of structure S

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-structure-array.html

[Abdulhakim Alezzi]

Yes, This is helping.

Thank you very much.