Which is distinct from http://en.wikipedia.org/wiki/Identity_matrix On Apr 9, 2014 4:31 PM, "Nick Ward" <[email protected]> wrote:
> http://en.wikipedia.org/wiki/Zero_matrix > On 9 Apr 2014 21:26, "Tommi Tissari" <[email protected]> wrote: > >> > On 09 Apr 2014, at 20:46, Kevin Ballard <[email protected]> wrote: >> > >> > Why? Zero is the additive identity. >> >> Zero is _an_ additive identity for numbers, but not for vectors or >> matrices. >> >> use std::slice::Items; >> use std::iter::RandomAccessIterator; >> use std::num::Zero; >> >> Items is a RandomAccessIterator, but a RandomAccessIterator is not an >> Items. 0 is an additive identity, but an additive identity is not 0. You >> can't assign a zero to a 2x2 matrix, and therefore this trait is >> incorrectly named. The following just looks wrong: >> >> let m: Matrix = Zero::zero(); >> >> > AdditiveIdentity is the only reasonable alternative, but that's a >> mouthful of a name and I think changing the name to this would be more >> confusing. >> >> Naming a trait something that it's not is even more confusing. I don't >> think we should give an incorrect name to this trait on the grounds of the >> correct name being longer. Just look at RandomAccessIterator. >> >> _______________________________________________ >> Rust-dev mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/rust-dev >> > > _______________________________________________ > Rust-dev mailing list > [email protected] > https://mail.mozilla.org/listinfo/rust-dev > >
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