I have done encryption on my audio file by using AES algo encryption that is giving error given below:
Error using cipher (line 38)
Plaintext has to be a vector (not a cell array) with 16 elements.
Error in aes_demo (line 37)
ciphertext = cipher (V2, w, s_box, poly_mat, 1);
sir firstly i tried to convert it after encryption but it doesnt works after that i tried to convert it before applying AES algo but it is giving me the same error . i have applied these lines for conversion of 2d array into vector.
V1 = x(:);
V2 = reshape(x, 1, []);
V3 = reshape(x, numel(x), 1);
Help me please, I have been stuck in at this point.
The problem is that x is a cell array. Without knowing more about your x, it's hard to give a solution, but x=[x{:}] might do the trick.
Dear Amina,
Try this: B = A ( : ), or try the reshape function.
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/reshape.html
Thanks
Please, tell us what is inside x, before we can figure out the right way to convert it into a vector.
Hallo Amina,
as stated above, to me it's not easy to figure out how to fix your problem unless I know what x is. I took a look at the AES pdf by Bochholz http://buchholz.hs-bremen.de (you probably know better than me) and think you could try like that:
plaintext_hex = {'00' '11' '22' '33' '44' '55' '66' '77' '88' '99' 'aa' 'bb' 'cc' 'dd' 'ee' 'ff'};
plaintext = hex2dec (plaintext_hex);
That's because the first line build a series of 16 bytes (from chars) avoiding them to concatenate in a single string (that's why a {cell} is used instead of a simple [array]).
Then the second line transforms it in the set of corresponding numbers.
From what I can guess, if you have a 2D cell array, provided that it contains 16 bytes like 'aa', e.g.
plaintext_hex = {...
'00' '11' '22' '33';...
'44' '55' '66' '77';...
'88' '99' 'aa' 'bb';...
'cc' 'dd' 'ee' 'ff'};
then try this way
V= hex2dec ( plaintext_hex(:) )
BEWARE, use (:) instead of {:} to avoid concatenation.
Let us know if this helps or please tell us how x is!
Bye
i don't know what is happening inside in your code but one way to convert 2d array into vector is as follows
[i j k] = find(x)
after this command k contains the elements of the matrix in a single column vector, it extracts the column vectors of x not row vectors...
hi Amina,
i think it a problem arise due to convert non-cell array to cell array ..
Plz visit the below link
http://www.mathworks.in/help/matlab/ref/cell2mat.html
To convert a 2D matrix of data to a line data, there are four well known transformations that provide a linear identifier from a 2D corrdinate values :
we can use :- row major identifier
- snike like identifier
- shufled identifier and
- shufled Row major identifier
according to the engaged algorithm on a 2D plan you can reduce the computation to the one of the straight line identifiers.
You can use reshape(.) function, for example:
A = [1 2 3 ;
4 5 6];
B = reshape(A,[3,2])
The answer is :
B=
1 2 3 4 5 6
%%%% Converting Matix to vector A = [1 2 3; 4 5 6; 7 8 9] % Example matrix reshape(A,[],1) % convert matrix to column vector reshape(A,1,[]) % convert matrix to row vector
Using a builtin reshape function in matlab.
M = Matlab matrix.
R = reshape(M,[], 1);
R will convert M into a single row.
If you have a matrix like A=[1 2 3; 4 5 6; 7 8 9]
The vector can be obtained with the two points
v=A(:);
v=[1 2 3 4 5 6 7 8 9];
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