Quote:

"(x + y) is an expression rather than a statement. The J programmer can embed (x + y) in a larger expression, perhaps a matrix multiplication (w +/ . * (x + y)) which adds the equivalent of three more nested loops, but is still a single expression. Expressions can be combined; statements cannot."

What about an expression like (x * x + y * y)? This would still be a single loop in C. Is J smart enough to figure that out, or will it turn that into three loops?