how to create binary matrix in matlab

hello,

I'm wondering how to create a binary matrix in matlab

and how to convert a matrix from decimal to binary and from binary to decimal

[James Tursa]

Please give a short example of what you mean by decimal and binary matrix, and what the conversion would be for this example.

[Abdelmalek Benaimeur]

for example

dec=[1;2;3;4;5]

bin=[0001;

0010;

0011;

0100;

0101]

is this possible ?

[Erick Huelsz]

I am sure there must be an easier way, but so far I managed to do this with the info I found:

D=[1,2,3,4,5]

l=length(D)

for i=1:l

bin = '0000000000';

bin = [bin dec2bin(D(i))];

b=(bin(end-l+1:end))=='1';

M(i,1:l)=b;

end

M

[Erick Huelsz]

yeah, there was a little easier way:

D2=[1,2,3,4,5]

l=length(D2)

for i=1:l

b=dec2bin(D2(i))

b=b-48

M2(i,l+1-length(b):l)=b

end

Answer 1

[KALYAN ACHARJYA]

For the First part of the question please refer to link here (@Walter Roberson's answer)

Second part, this is broad way to express-

Here I trying one example, please look

>> a=randi(5,5)
a =
     1     5     2     5     4
     5     5     4     4     4
     3     3     2     2     5
     5     2     4     4     5
     4     1     1     2     2
>> binary=(a<3)
binary =
     1     0     1     0     0
     0     0     0     0     0
     0     0     1     1     0
     0     1     0     0     0
     0     1     1     1     1

Here this is logical expression

If you are talking to decimal to binary, as processor do the computaion in binary values only, all decimal elements convert to binary as general. I hope you know the procedure.

Or check here

Answer 2

[James Tursa]

>> dec=[1;2;3;4;5];
>> bin = dec2bin(dec,4)
bin =
0001
0010
0011
0100
0101
>> bin2dec(bin)
ans =
     1
     2
     3
     4
     5

[Abdelmalek Benaimeur]

thaaaaaaaaaaaank you

[Abdelmalek Benaimeur]

i have one more question if possible ?

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 ?

[James Tursa]

How is A in your example above a double? Do you mean you want to input it as written above where 0010 would be "ten" as a double, but then turn around and re-interpret it as a binary character array? I.e., something like this?

bin = reshape(sprintf('%04d',A),4,[])'

[Abdelmalek Benaimeur]

no what i meant is

let's take the same example

dec=[1;2;3;4;5];

the class of this vector is : double

when i do this

bin = dec2bin(dec,4)

i obtain char array like this

bin =

5×4 char array

'0001'

'0010'

'0011'

'0100'

'0101'

my question is when converting from dec to bin

how can i obtain the result in a matrix and not a char array

so that matlab reconize that the elements of this matrix are binary and not double

[James Tursa]

I assume by binary you really mean logical. Then simply

bin = (bin == '1')

Answer 3

[Abdelmalek Benaimeur]

please could you tell me what is the meaning of a<3 here : binary=(a<3)

[KALYAN ACHARJYA]

This is logical representation, all elements of a, which are less than 3 are true (1) and others false. Please response on @James Tursa comment