MathGroup Archive 1999

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

Search the Archive

Protected element error

  • To: mathgroup at smc.vnet.net
  • Subject: [mg17229] Protected element error
  • From: Kristen Rounds <krounds at accessone.com>
  • Date: Mon, 26 Apr 1999 02:00:14 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Early in my program I define a 4x4 matrix:

A1x:=M.b1x.Transpose[M];

Later I wish to allow the user to modify a matrix element:

If[StringMatchQ[terma,"a33",IgnoreCase->True],
"A"<>sur<>"x"[1,1]=Input["New a33 x value"]];

I am getting this error when I try to use the new A1x matrix:

SetDelayed::write: Tag StringJoin in A<>1<>x is Protected.

I tried to use Unprotect[A1x]; prior to the new input, but that
doesn't seem to make a difference.

Please explain this error, and if there is a way to avoid it.  Thanks.

Kristen




  • Prev by Date: Re: Fibonacci [5,000,000] contains 1044938 decimal digits
  • Next by Date: Polar vector field plot
  • Previous by thread: Re: 3d Custom Color Output
  • Next by thread: Protected element error