Thread Subject:

get position of "1" in a binary number

Hi!
I am working with binary numbers that have at maximum 8 bits.
I would like to get the position of the ones in my binary numbers, for example:
a=1010;
I will get pos=[4,2]

b=110001
I will get pos=[6,5,1]

Is that possible?
Thakns in advance

Camille.

On Feb 17, 8:40 am, "Camille Couzi" <camilleco...@yahoo.fr> wrote:
> Hi!
> I am working with binary numbers that have at maximum 8 bits.
> I would like to get the position of the ones in my binary numbers, for example:
> a=1010;
> I will get pos=[4,2]
>
> b=110001
> I will get pos=[6,5,1]
>
> Is that possible?
> Thakns in advance
>
> Camille.

If b is a string:

b = "10110100"
find(b=='1')
ans =
     1 3 4 6

Otherwise:
b = 10110100
find(num2str(b)=='1')
ans =
     1 3 4 6

I hope that helps.

-Nathan

Thanks a lot nathan, that's just what I needed!
Camille!

>> a = [1,0,0,1,1];
>> find(a)

ans =

     1 4 5

>>
>> a = '10011';
>> strfind(a,'1')

ans =

     1 4 5

>> a = 19;
>> strfind(dec2bin(a),'1')

ans =

     1 4 5

On Feb 17, 11:40 am, "Camille Couzi" <camilleco...@yahoo.fr> wrote:
> Hi!
> I am working with binary numbers that have at maximum 8 bits.
> I would like to get the position of the ones in my binary numbers, for example:
> a=1010;
> I will get pos=[4,2]
>
> b=110001
> I will get pos=[6,5,1]
>
> Is that possible?
> Thakns in advance
>
> Camille.

And just to introduced one more way:


>> find(de2bi(10110100 ,[], 10, 'left-msb'))

ans =

     1 3 4 6

/reza