Feature Request: implement all the things from alga

[richard-uk1]

I was looking for implementors of alga::linear::AffineTransformation, but the request could equally apply to other traits. Is it part of the plan to implement them all?

[sebcrozet]

They are already all implemented whenever they are relevant. We may have missed a few spots though. Do you have anything specific in mind? What type should implement AffineTransformation and does not (currently it is implement by Translation{2,3}, Isometry{2,3}, Similarity{2,3}, and Affine{2,3})?

[jswrenn]

I think this may be an unfortunate API discoverability issue. Although AffineTransformation is already implemented for Similarity, UnitQuaternion, UnitComplex, Rotation, Translation, and Isometry, it's not really possible to get that list without grepping the nalgebra source.

To solve this, we can add this to lib.rs:

/// For documentation purposes only; do not rely on items from this module.
#[deprecated(note = "For documentation purposes only; do not rely on items from this module.")]
pub mod alga_documentation {
    pub use alga::*;
}

This will cause rustdoc to display all of the nalgebra types that implement each trait:

Once doc_cfg is stabilized, we can actually hide that module for everything except rustdoc-triggered compilations.

[richard-uk1]

I see. That's unfortunate, but thanks for getting back to me! I saw no implementors in the alga docs and assumed they hadn't been implemented.

However it's great that they are already implemented! :)

[richard-uk1]

It seems that the implementation of AffineTransformation for Transformation is commented out with a note saying that you need SVD, but I think SVD is implemented.

I tried to get it working but can't cope with the trait bound errors :'(

[Andlon]

Since the design of nalgebra has pivoted to simba instead of alga, I will close this issue.