MathGroup Archive 2010

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: How do I test for existence of a list element?


You could test whether the index you are using is larger than the
length of the list using Length[ ], but it would seem like bad
programming if such an index could accidentally pop up.

Cheers -- Sjoerd

On Sep 25, 8:21 am, Joseph Gwinn <joegw... at comcast.net> wrote:
> I have an application where I am bouncing around in a list, and may
> accidentally ask for an element beyond the end of the list, which causes
> Mathematica to complain and balk, preventing completion.
>
> Is there any way to test for the existence of a list element without
> provoking complaint or balking should the list item fail to exist?
>
> Thanks,
>
> Joe Gwinn



  • Prev by Date: Re: How do I test for existence of a list element?
  • Next by Date: Re: How do I test for existence of a list element?
  • Previous by thread: Re: How do I test for existence of a list element?
  • Next by thread: Re: How do I test for existence of a list element?