matrix and binary bits

Question

athpapa - 2011-11-13

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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..

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Answer 1

Walter Roberson 2011-11-13

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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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athpapa - 2011-11-13

thanx for your help...

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Answer 2

bym 2011-11-13

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dec2bin([1:5])
ans =
001
010
011
100
101

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athpapa - 2011-11-13

I don't want this. I just want the first matrix A to point in the second matrix B which has binary bits but in demical numbers. B=[00 01 11 10]. And when I type C=B(1) to give me the first two zeros, when type B(2) the zero and one and so on...Do you know how can I do this?

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