On Sun, Mar 03, 2002 at 12:11:13AM +0900, Yukihiro Matsumoto wrote:
> I asked Keiju, who has been my friend for long time, and he replied
> that that's because he wanted matrix to be immutable just like other
> numeric values.

Hmm, I see a matrix as more of a two-dimensional array with arithmetic
operators redefined for matrix operations.

If an array is mutable, a matrix should be mutable, too.

(if you need further convincing, consider the performance implications
of constructing a new matrix just to change a single cell).

Paul