Update an array

[afullo]

Is there a way to update an array depending on some variables, when these
variables are changed?

For example, I was thinking whether is possible to obtain something like
that:

a = 1;
A = [1 a a^2];
A
A =

   1   1   1

a = 2;
*update* A;
A
A =

   1   2   4

In this case it could seem not of much interest (why to use a new command,
while it is sufficient to repeat A = [1 a a^2] ?), but in fact it could be
useful when the definition of A is more complicated (for example, it could
involve more than one variabile, or it could be piecewise).

Thanks in advance.



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