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Question: protect table

Question:protect table

fbackelj 271 Maple
array assign
April 07 2006
0
Hello, I was wondering whether there is any way to protect a table. I have the following situation: > f := table([ a = table([ a1 = 1, a2 = 2 ]), b = table([ b1 = 3, b2 = 4 ]) ]); That is, f[a] returns another indexed table. Now, when I do protect(f), protect(f[a]) or even protect(f[a][a1]), I cannot change its value any more: > protect(f); > f[a][a1] := test; Error, attempting to assign to array/table `f` which is protected But if I assign f[a] to a new variable g, then I can do it: > g := f[a]; > g[a1] := test; > eval(f); table([a = table([a1 = test, a2 = c]), d = table([d1 = i, d2 = j])]) I guess it has something to do with last_name_eval, but I'm not sure. The thing is that, if I can get this to work, I can use the elements from the table immediately, while I now have to work with an explicit copy of f[a] in order to avoid these possible changes to f[a] via g... Thanks in advance for any reply. Regards, Franky.
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