ndarray-rand

[DevinBayly]

The random function from the ndarray_rand::RandomExt trait seems to go unrecognized when following the test example on the repo.

extern crate rand;
extern crate ndarray;
extern crate ndarray_rand;



#[cfg(test)]
mod tests {
    use rand::distributions::Range;
    use ndarray::Array;
    use ndarray_rand::RandomExt;

    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
        let (mm, nn) = (5, 5);
        for m in 0..mm {
            for n in 0..nn {
                let a = Array::random((m, n), Range::new(0., 2.));
                assert_eq!(a.shape(), &[m, n]);
                assert!(a.iter().all(|x| *x <= 2.));
                assert!(a.iter().all(|x| *x >= 0.));
            }
        }
    }
}

cargo test generates this compilation error

   Compiling randarr v0.1.0 (/tmp/randarr)                                                                                                            
error[E0599]: no function or associated item named `random` found for type `ndarray::ArrayBase<ndarray::OwnedRepr<_>, _>` in the current scope        
  --> src/lib.rs:19:25                                                                                                                                
   |                                                                                                                                                  
19 |                 let a = Array::random((m, n), Range::new(0., 2.));                                                                               
   |                         ^^^^^^^^^^^^^ function or associated item not found in `ndarray::ArrayBase<ndarray::OwnedRepr<_>, _>`                    
                                                                                                                                                      
error: aborting due to previous error                                                                                                                 
                                                                                                                                                      
For more information about this error, try `rustc --explain E0599`.                                                                                   
error: Could not compile `randarr`. 

[jturner314]

I'm not able to reproduce the issue. When I run cargo test in the ndarray-rand crate, all the tests pass. When I create a project with the following contents:

• Cargo.toml

  [package]
  name = "foo"
  version = "0.1.0"
  
  [dependencies]
  ndarray = "0.12"
  ndarray-rand = "0.8"
  rand = "0.5"

• src/main.rs

  extern crate rand;
  extern crate ndarray;
  extern crate ndarray_rand;
  
  use rand::distributions::Range;
  use ndarray::Array;
  use ndarray_rand::RandomExt;
  
  fn main() {
      assert_eq!(2 + 2, 4);
      let (mm, nn) = (5, 5);
      for m in 0..mm {
          for n in 0..nn {
              let a = Array::random((m, n), Range::new(0., 2.));
              assert_eq!(a.shape(), &[m, n]);
              assert!(a.iter().all(|x| *x <= 2.));
              assert!(a.iter().all(|x| *x >= 0.));
          }
      }
  }

it builds and runs fine. I'm using Rust 1.30.0.

Does the example I provided above work on your machine? If so, will you please provide more details about the case that is failing for you?

[DevinBayly]

Very strange! Setting up the project as you have I also don't get any errors. It appears its related to ndarray being version 11 in my cargo toml.

…

On Wed, Nov 7, 2018 at 6:45 AM, Jim Turner ***@***.***> wrote: I'm not able to reproduce the issue. When I run cargo test in the ndarray-rand crate, all the tests pass. When I create a project with the following contents: - Cargo.toml [package]name = "foo"version = "0.1.0" [dependencies]ndarray = "0.12"ndarray-rand = "0.8"rand = "0.5" - src/main.rs extern crate rand;extern crate ndarray;extern crate ndarray_rand; use rand::distributions::Range;use ndarray::Array;use ndarray_rand::RandomExt; fn main() { assert_eq!(2 + 2, 4); let (mm, nn) = (5, 5); for m in 0..mm { for n in 0..nn { let a = Array::random((m, n), Range::new(0., 2.)); assert_eq!(a.shape(), &[m, n]); assert!(a.iter().all(|x| *x <= 2.)); assert!(a.iter().all(|x| *x >= 0.)); } } } it builds and runs fine. I'm using Rust 1.30.0. Does the example I provided above work on your machine? If so, will you please provide more details about the case that is failing for you? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#530 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ALJWzw8w8X83G4L8V1g-QrchwoYnvrtuks5usuPcgaJpZM4YR0SH> .

[jturner314]

Make sure the versions you're using are consistent. For example, ndarray-rand 0.8 requires ndarray 0.12 and rand 0.5, while ndarray-rand 0.7 requires ndarray 0.11 and rand 0.4. (See the README.)

[DevinBayly]

I see! Sorry that seems like something which could have been avoided. Thanks for the help!

…

On Wed, Nov 7, 2018 at 10:56 AM, Jim Turner ***@***.***> wrote: Make sure the versions you're using are consistent. For example, ndarray-rand 0.8 requires ndarray 0.12 and rand 0.5, while ndarray-rand 0.7 requires ndarray 0.11 and rand 0.4. (See the README. <https://github.com/rust-ndarray/ndarray/tree/master/ndarray-rand>) — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#530 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ALJWz-OafX3clsKeLKoEhwf5SNy7O0yvks5usx7FgaJpZM4YR0SH> .

[jturner314]

You're welcome. It's always nice when the problem is easy to solve. :)

[jturner314]

By the way, this is related to rust-lang/rust#22750.