MATLAB: Matrix and binary bits

binarymatrix

I have a matrix that I use it like an index, for example: A=[1 3 2 4 1 3] which points to a matrix which represents binary bits B=[00 01 11 10]. How can I produce these bits (like decimal numbers of course) but in a single line matrix (e.g. 0 0 1 1 0 1 1 0 0 0 1 1)? I mean I want: C=B(1) gives me 0 0, C=B(2) gives me 0 1 and so on…

Thank you..

Best Answer

It is not possible to do what you want. There is no data type in MATLAB with which you can supply a single index and get out a vector of numeric values using () subscripting. Cell arrays come close, but when you use () subscripting with them, you get out a cell array that contains the vector, rather than the vector itself. You can use {} subscripting with a cell array to "unwrap" the cell array from the vector:

B={{0 0} {0 1} {1 1} {1 0}};
C = B{1};

But really it is easier to use straight arrays and appropriate indexing:

B = [0 0; 0 1; 1 1; 1 0];
C = B[1,:];

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Hi athpapa,

I don't know what your "A" matrix or "symbols" matrix had, so I will just make them random numbers:

A = randi(500, 10) - 250;
symbols = randi(30,1,1000);

Now, we can make "k" as a vector of numbers (rather than just a single number). Note that I use "i" to iterate from 1:1000 so that we know which element of "k" to save our answer to:

k = zeros(1,1000);
for i = 1:1000
    m = symbols(i);
    d1=abs(m-A);
    [C,I]=min(d1(:));
    k(i) = A(I);
end

Does this do what you wanted it to do?

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B = A - '0';

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