how to define binary matrix in matlab?

2019 4 25
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更新时间：2019 4 25
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let's suppose that i have this matrix
A=[0001
0010;
0011;
0100;
0101]
how can i define it to matlab so that it will be reconized as binary matrix and not double ?

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James Tursa
James Tursa 2019-4-25
编辑：James Tursa 2019-4-25

0 个投票

If you mean that you type in the A matrix exactly as above, but want to reinterpret the decimal digits as binary digits, then maybe something like this:
>> A=[0001
0010;
0011;
0100;
0101]
A =
1
10
11
100
101
>> bin = reshape(sprintf('%04d',A),4,[])'
bin =
0001
0010
0011
0100
0101
If you wanted that as a logical matrix instead of a char matrix, then
bin = (bin == '1')

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bin = reshape(sprintf('%04d',A),4,[])'
returns char_array i want the result in a matrix
Adam Danz
Adam Danz 2019-4-25
编辑：Adam Danz 2019-4-25
@Abdelmalek Benaimeur
If you're looking for a numeric matrix with 0 placeholders, that's not going to happen. Even the dec2bin() function outputs a char array.
dec2bin([1:5])
ans =
5×3 char array
'001'
'010'
'011'
'100'
'101'
Your initial matrix "A" is already in numeric form and represents the same binary as if it had place holders.
A =[
1
10
11
100
101];
bin2dec(num2str(A))
ans =
1
2
3
4
5
bin = ['0001'
'0010'
'0011'
'0100'
'0101'];
bin2dec(bin)
ans =
1
2
3
4
5
@James Tursa
please last question
see this code
A =
6 2 2
3 5 1
7 4 6
5 8 3
6 8 9
3 7 9
>> bin = dec2bin(A,4)
bin =
18×4 char array
'0110'
'0011'
'0111'
'0101'
'0110'
'0011'
'0010'
'0101'
'0100'
'1000'
'1000'
'0111'
'0010'
'0001'
'0110'
'0011'
'1001'
'1001'
>> bin=(bin=='1')
bin =
18×4 logical array
0 1 1 0
0 0 1 1
0 1 1 1
0 1 0 1
0 1 1 0
0 0 1 1
0 0 1 0
0 1 0 1
0 1 0 0
1 0 0 0
1 0 0 0
0 1 1 1
0 0 1 0
0 0 0 1
0 1 1 0
0 0 1 1
1 0 0 1
1 0 0 1
>> bin2dec(num2str(bin))
ans =
6
3
7
5
6
3
2
5
4
8
8
7
2
1
6
3
9
9
how can i obtain the original matrix A in this case?
James Tursa
James Tursa 2019-4-25
If you know the size of the original A is 6x3, then simply reshape
>> reshape(bin2dec(num2str(bin)),6,3)
ans =
6 2 2
3 5 1
7 4 6
5 8 3
6 8 9
3 7 9
If you don't know the size of the original A, then you are stuck because that information is not contained in the variable bin. You would need some other way to know what the variable size should be.
@James Tursa
believe me you are the best
this is for my graduation projet i will add your name as a reference
wish you all the best

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