On Sat, Mar 15, 2014 at 9:58 AM, Robert Kern <robert.kern@gmail.com> wrote:
On Sat, Mar 15, 2014 at 2:49 PM, Charles R Harris
<charlesr.harris@gmail.com> wrote:
>
> I favor the weak right option.
>
> 1) Giving '*' higher precedence than `@` makes it easier, to my mind, to
> parse out what is going to happen: all the element-wise multiplications,
> followed by the matrix operations. I'd probably still use parenthesis for
> clarity.

It seems to me that 'tight' gives the same benefit. Any reasoning for
the preference of 'weak' over 'tight'?


Two other reasons come to mind. First, '*' is right associative, so I think it is nicer to first view the expression as parsed into blocks separated by '@', which act somewhat like parenthesis at that point, and then evaluate the blocks. Second, and somewhat weaker, it might make it easier to track how arrays are broadcast.

Chuck