Accessing matrix elements

General Discussion
1

Two simple questions. Suppose I have a matrix created as

matrix C =
[[1, 2, 3],
[2, 4, 0],
[8, 1, 9]];

How can I access individual elements of this matrix? I have tried the obvious C[1][2] = 5 but this syntax is not allowed.

Also, how would I create a matrix without needing to specify its initial elements, as was done for C above? Something like “real[int][int] D(20, 20)”, although again this is not correct.

2

OK, I figured it out. The syntax is

   real[int, int] A(3, 3);

to create an array and

   A(1,2) = 7;

to access an element.