获取 1d Rust ndarray 的差异

Question

我觉得这段代码应该可以工作：

use ndarray::{Array1, s}; // 0.15.4

fn main() {
    let x = Array1::<f64>::range(0.0, 10.0, 1.0);
    println!("{:?}", x);
    println!("{:?}", x.slice(s![1..]));
    println!("{:?}", x.slice(s![..-1]));
    println!("{:?}", x.slice(s![1..]) - x.slice(s![..-1])); // fails to compile when this line is uncommented
}

如果我评论最后的印刷品，前 3 行印刷品确实有效。我在这里遗漏了什么吗？
Rust Playground Implementation

Answer 1

documentation 解释说：

Let A be an array or view of any kind. Let B be an array with owned storage (either Array or ArcArray). Let C be an array with mutable data (either Array, ArcArray or ArrayViewMut). The following combinations of operands are supported for an arbitrary binary operator denoted by @ (it can be +, -, *, / and so on).

&A @ &A which produces a new Array

B @ A which consumes B, updates it with the result, and returns it

B @ &A which consumes B, updates it with the result, and returns it

C @= &A which performs an arithmetic operation in place

And also:

You can use slicing to create a view of a subset of the data in the array. Slicing methods include .slice(), .slice_mut(), .slice_move(), and .slice_collapse().

所以你想用&x.slice(s![1..]) - &x.slice(s![..-1])（注意两个&）。

获取 1d Rust ndarray 的差异

get diff of 1d rust ndarray

rust

rust-ndarray