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Re: st: asarray_keys() error


From   Sergiy Radyakin <serjradyakin@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: asarray_keys() error
Date   Thu, 16 May 2013 10:03:18 -0400

Dear Matthew,

I can confirm the problem also reproducible in Stata 11.2.

The problem is likely the collision of hashes generated with hash1()
function. Such collisions are unlikely, though possible. This is also
consistent with your observation of changing the keys does not
generate the error. Note that the problem does not occur if you add a
"_" (an underscore) to each of your keys. (but this is data-dependent,
there will be a combination that will collide again, but perhaps you
will be lucky not to encounter it in your data). Would this would be a
suitable workaround for you?

Best, Sergiy Radyakin

mata:
A = asarray_create("string", 2)
asarray(A, ("_type", "_keep"), 1)
asarray(A, ("_name", "_char"), 2)
asarray_stats(A)
asarray_keys(A)

end


: asarray_keys(A)
           1       2
    +-----------------+
  1 |  _name   _char  |
  2 |  _type   _keep  |
    +-----------------+


On Wed, May 15, 2013 at 5:35 PM, Matthew White
<mwhite@poverty-action.org> wrote:
> Hi Statalist members,
>
> I'm running the following commands in Stata 12.1 SE:
>
> mata:
> A = asarray_create("string", 2)
> asarray(A, ("type", "keep"), 1)
> asarray(A, ("name", "char"), 2)
> asarray_keys(A)
>
> However, -asarray_keys()- issues the following error message:
>
> asarray_keys_dup():  3201  vector required
> asarray_keys():     -  function returned error
> <istmt>:     -  function returned error
>
> If I run -asarray()- for just one key, -asarray_keys()- does not
> result in an error. For example:
>
> mata:
> A = asarray_create("string", 2)
> asarray(A, ("type", "keep"), 1)
> asarray_keys(A)
> end
>
> If I change any one of the elements of the keys, -asarray_keys()- also
> does not result in an error:
>
> mata:
> A = asarray_create("string", 2)
> asarray(A, ("example", "keep"), 1)
> asarray(A, ("name", "char"), 2)
> asarray_keys(A)
> end
>
> Any suggestions would be appreciated.
>
> Thank you,
> Matt White
>
> --
> Matthew White
> Senior Project Associate
> Innovations for Poverty Action
> 101 Whitney Avenue, New Haven, CT 06510 USA
> www.poverty-action.org
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