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Re: st: Re: Decomposing integers


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Decomposing integers
Date   Thu, 19 Jul 2012 14:08:45 +0100

You said you wanted a local macro. Look at -inbase- for binary representations.

Nick

On Thu, Jul 19, 2012 at 1:48 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>  clear
>  set obs 100
>  gen y = _n
>  gen Y = mod(y, 32)
>  egen bin = base(Y)
>  gen wanted = reverse(bin) + string(floor(y/32))
>
> . l if y == 22 | y == 65
>
>      +--------------------------+
>      |  y    Y     bin   wanted |
>      |--------------------------|
>  22. | 22   22   10110   011010 |
>  65. | 65    1   00001   100002 |
>      +--------------------------+
>
> The extra -egen- function here is -base()- from -egenmore- (SSC).
>
> Nick
>
> On Thu, Jul 19, 2012 at 1:00 PM, A Loumiotis
> <antonis.loumiotis@gmail.com> wrote:
>> The last local should contain 1 0 0 0 0 2.
>>
>> On Thu, Jul 19, 2012 at 2:54 PM, A Loumiotis
>> <antonis.loumiotis@gmail.com> wrote:
>>> Hi,
>>>
>>> I have integer numbers of the following form:
>>>
>>> X=Sum[i=0/4](a[i]2^i)+(a[5]*2^5)
>>>
>>> where a[i] equals either 0 or 1 if i=0/4 and a[5] equals to any
>>> positive integer or 0.
>>>
>>> Given this construction I would like to find the unique combinations
>>> of a[i]'s that generated X.
>>>
>>> For example:
>>>
>>> X=22 was generated using a[1]=1, a[2]=1 and a[4]=1.
>>> So I would like to construct a local that contains the following list
>>> 0 1 1 0 1 0
>>>
>>> X=65 was generated using a[0]=1 and a[5]=2
>>> So in this case the local should contain 1 0 0 0 0 1
>>>
>>> Is this possible?
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