dot indexing is not supported for this variable .

for i = 1:40
    test     = eeg_c(i,:,1);
    y        = test.y(1:1000,1); % error occuring in this line how to rectify it ?
    S(:,i)   = y;
end

eeg_c size is (40*1000*5)

[Andrei Bobrov]

S = eeg_c(:,:,1).';

Answer 1

[madhan ravi]

See if the below does what you want(else let know of your final result size expected), also suspect loop is not needed to achieve what you want:

S=zeros(1000,40); % preallocate
for i = 1:40
    test     = eeg_c(i,:,1);
    S(:,i)   = test;
end