Custom type subscript assignment

[r-j-k]

Hi, I'm close to finishing my custom matrix type. I have implemented
subscript assignment and it works correctly:

octave:13> x = my_matrix([10, 9, 8]);
octave:14> x(2)
ans =  9
octave:15> x(2) = 5
x =

   10    5    8

However, when I make a copy of x, y = x, and try to assign to either y or x,
the behaviour is as if x or y are undefined:

octave:16> x = my_matrix([10, 9, 8]);
octave:17> y = x
y =

   10    9    8

octave:18> y(2) = 5
y =

   0   5

After the value of y is changed as above, I can correctly assign to x:

octave:19> x(2) = 5
x =

   10    5    8


I realise that y is not a deep copy and something related to that is
probably causing my problem. I know that my subscript assign operator is not
being called at all in the problematic case. Any ideas how to correct this? 

Many thanks.
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