Re: Clear subscripted variables
- To: mathgroup at smc.vnet.net
- Subject: [mg58290] Re: [mg58276] Clear subscripted variables
- From: Pratik Desai <pdesai1 at umbc.edu>
- Date: Sun, 26 Jun 2005 01:33:52 -0400 (EDT)
- References: <200506250556.BAA12738@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Mukhtar Bekkali wrote:
>Here is the code (x\_i stands for x subscript i):
>
>Table[{Print[x\_i = i]; Clear[x]; Remove[x]; Unset[x]; Print[x\_i]},
>{i, 1, 2}]
>
>I expected that x\_i is cleared at the end of the loop but it isn't
>
>If I insert Clear[Subscript] in the loop then it is cleared, but not
>desirable since it clears all variables with subscripts.
>
>What command shall I use to clear specific subscripted variables?
>
>Mukhtar Bekkali
>
>
>
Hi,
Here is what I think the problem is
Why is x equal to x\_i?
Even if it is, how can mathematica know it
I think what you can try is
Table[Subscript[x, i] = 1, {i, 1, 2}]
(*Table[Unset[Subscript[x, i]], {i, 1, 2}]
Table[Subscript[x, i], {i, 1, 2}]*)
You can uncomment the unset table to clear the variables, or better yet
write a module to do it (i.e Unset the subscipted variables)
Here is a rough version of the same
unsetmod[x_, list_] := Module[{list1}, list1 =
list; Table[Unset[Subscript[x, list1[[s]]]], {s, 1, Length[list]}]]
Table[Subscript[x, i] = 1, {i, 1, 5}]
(*unsetmod[x, Range[2]]*)
Table[Subscript[x, i], {i, 1, 5}]
Best regards
Pratik
--
Pratik Desai
Graduate Student
UMBC
Department of Mechanical Engineering
Phone: 410 455 8134
- References:
- Clear subscripted variables
- From: "Mukhtar Bekkali" <mbekkali@gmail.com>
- Clear subscripted variables