MathGroup Archive 1999

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Protected element error

  • To: mathgroup at
  • Subject: [mg17229] Protected element error
  • From: Kristen Rounds <krounds at>
  • Date: Fri, 30 Apr 1999 02:34:29 -0400
  • Sender: owner-wri-mathgroup at

Early in my program I define a 4x4 matrix:


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

"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.


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