solve() seems missing in 0.16

[PegasusPlusUS]

My simple program main.rs try to resolve linear equations:

use ndarray::prelude::*;
use ndarray_linalg::*;

fn main() {
    let a: Array2<f64> = array![[3.0, 2.0], [1.0, 2.0]];
    let b: Array1<f64> = array![5.0, 5.0];
    let x = a.solve(&b).unwrap();  // Solve the system A * x = B
    println!("Solution: {:?}", x);
}

It works when I use ndarray 0.15 and ndarry_linalg 0.15:

[package]
name = "solve"
version = "0.1.0"
edition = "2021"

[dependencies]
ndarray = "0.15"  # Or whichever version you're using
ndarray-linalg = { version = "0.15", features = ["openblas-system"] }
pkg-config = "0.3"

When I try to use recent ndarray version 0.16, main.rs can't compile:
error[E0599]: no method named solve found for struct ArrayBase in the current scope
--> src/main.rs:7:15
|
7 | let x = a.solve(&b).unwrap(); // Solve the system A * x = B
| ^^^^^ method not found in ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>

[akern40]

Unfortunately this is a version mismatch between ndarray and ndarray-linalg; you cannot use ndarray version 0.16 with ndarray-linag until linalg bumps its dependencies. See this issue on ndarray-linalg for more, and this issue on the maintainership discussion there.

[PegasusPlusUS]

Thanks for answering. Before committing this issue, I also tried using both "0.16" version of ndarray_linalg and ndarray together, the same compiler error, so I guess there's some interface changing that break old examples (ChatGPT told me the simple solve sample)

[akern40]

Ya it's because of the minor version change between 0.15 and 0.16, I believe. You can read more here about Rust's dependency resolution between versions.