Re: How do I test for existence of a list element?
- To: mathgroup at smc.vnet.net
- Subject: [mg112685] Re: How do I test for existence of a list element?
- From: Robert Rosenbaum <robertr at math.uh.edu>
- Date: Sun, 26 Sep 2010 02:45:30 -0400 (EDT)
I think you're looking for MemberQ If you're doing a lot of work on lists, I suggest you browse the ListManipulation help files for a while. Mathematica has a lot of powerful built in functions that might make your work a lot easier. Best, Robert On Sep 25, 2010, at 1:20 AM, Joseph Gwinn 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 >