rust crate dependencies: norman::Norm trait is not defined for ndarray::Array1

I am trying to get a P-norm for my simple 1D Vec in Rust, but I am failing with every norman example. Error states that there is no method named `norm` found for struct `ArrayBase` in the current scope.

What I did:

1. cargo new norman-test
2. cd norman-test
3. cargo add ndarray
4. cargo add norman
5. replace main.rs with:

use ndarray::Array1;

use norman::Norm;
use norman::desc::{Sup, PNorm};

fn main() {

    let a = Array1::from(vec![2.0f32, -4.0, -2.0]);

    assert_eq!(a.norm(Sup::new()), 4.0);
    assert_eq!(a.norm(PNorm::new(2)), (2.0f32*2.0 + 4.0*4.0 + 2.0*2.0).sqrt());
    assert_eq!(a.norm(PNorm::new(1)), 2.0f32 + 4.0 + 2.0);
}

I feel like I am missing something obvious, but I cannot find any other examples or some answers on how to properly use crates with dependencies. I'm not even sure what to ask. Thanks

The latest version of norman, 0.0.4, depends on ndarray ^0.12.0, but your cargo add will have gotten ndarray 0.15.16, which is not a semver-compatible version, so cargo compiles the 0.12.* and 0.15.* versions separately.

So, norman is implementing Norm for ndarray::ArrayBase version 0.12 but not for ndarray::ArrayBase version 0.15.

Things you can do about this situation:

• Change your dependency to ndarray = "^0.12" (edit your Cargo.toml) so you're using the same version as norman is.
• Convince the author of norman to publish an updated version.
• Take the source code of norman and patch it to work with ndarray ^0.15.
• Write code for the norms you want in your own crate, or copy code from norman (license permitting).