Bit stream in to digits

Question

Raza 2014-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/116775-bit-stream-in-to-digits

回答： Jos (10584) 2014-2-19

i have a stream of bits(1 and o), when i save these bit , like i have 128 bits, b1 contains 1 to 10 bits, b2 contain 11 to 20 and so on. Now i got a problem that when i save these bits in b1, b2 , b3 and so on. and want to retrieve, it gives value instead of binary digits, so to solve this issue, i used bitget command but it only support 52 digits, while my requirement is 128

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Jos (10584) 2014-2-19

Please elaborate ...

Raza 2014-2-19

i have a stream of bits (1 and 0) , let assume its length is 40. now using for loop i am saving first ten bits in b1, next ten bits in b2 and so on...

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Answer 1

Mischa Kim 2014-2-19

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Raza, you can retrieve the bit pattern by concatenating the cell strings:

[r, c] = size(b);
bit_stream = [];
for ii = 1:c
    bit_stream = strcat(bit_stream,b{ii});
end
disp(bit_stream)

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Jos (10584) 2014-2-19

在 MATLAB Online 中打开

STRCAT can concatenate an infinite number of arguments. In Mischa's nice answer you can exploit comma-separate list expansion and get rid of the for-loop:

b = {'101','000','111','010','101'} % shortened example
bitstream = strcat(b{:})

Raza 2014-2-19

编辑：Raza 2014-2-19

Thanks man, but still got a problem, let me tell u complete detail. i am taking text as a input then i am converting this text into 8 bit binary. and these 8 bits are combined. now i want to separate 128 bits. for example i have text entered "Matlab is good language for coding." and in bits form it is "0101010100010010100100010100100101010101001010..." let assume its length is 256. now i want 128 128 block of bits? i am just stuck in last part

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Answer 2

Jos (10584) 2014-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/116775-bit-stream-in-to-digits#answer_124939

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You can split the string into cells

% (smaller) example 
MyStr = '10100101010101010010101010101010' ; % a string of arbitrary length
N = 5 ; % the size of each block (in your case 128).
maxN = numel(MyStr) 
ix0 = 1:N:maxN
fh = @(X) MyStr(X:min((X+N-1),maxN))
B = arrayfun(fh,ix0,'un',0)
% now B{K} holds the K-th block of N bits of S
MyStrToo = cat(2,B{:})
isequal(MyStrToo, MyStr) % check!