How to select elements from matrix?

For the below code we will get 53440*8 matrix.

fid  = fopen( 'audio.wav');
data = fread(fid, [1, Inf], 'uint8');
fclose(fid);
bit = uint8(rem(floor((1 ./ [128, 64, 32, 16, 8, 4, 2, 1].') * data), 2));
bit = bit(:);
bit = dec2bin(data) - '0'

Now I want to select 8*8 elements from the matrix.

How can I do that?Please help me out.

Thank you!

[dpb]

data = fread(fid, [1, Inf], 'uint8');
bit = uint8(rem(floor((1 ./ [128, 64, 32, 16, 8, 4, 2, 1].') * data), 2));
bit = bit(:);
bit = dec2bin(data) - '0'

What's the point of lines 2 and 3 when you immediately then overwrite the result?

Any 8x8 set of elements or some particular set(s)???

[N M Channabasavayya]

Particular sets..like starting 8*8 elements.

or can you suggest me in general how can I select elements?

[dpb]

N=8;                % how many (if not necessarily 8 rows)
i1=1;               % set first index
i2=i1+N-1;          % compute last row index
B=bit(i1:i2,:);     % and select those rows, all columns