Question

我正在努力理解mathematica中以下积分的输出：

Root [c＃1 ^ 4 + a＃1 + b＆1]

这到底是什么意思？我已经查看了＃和＆的文档，但将所有内容放在一起以了解上述表达式有点令人困惑。

谢谢！

Answer 1

＃和＆的东西是将值注入函数调用的一种方式，这就是我倾向于阅读它的方式。

例如

struct Player { name: String, age: u8, description: String }
impl Player {
    fn namefn(&self) -> &String {
        &self.name
    }
}

fn immutable_borrow_nok(borrowed: &reqwest::blocking::Response) -> Result<()> {
    // println!("I am some json, I don't work {:#?}", borrowed.text()); <-- if I get uncommented I won't compile
    Ok(())
}
fn immutable_borrow(borrowed: &Player) -> Result<()> {
    println!("I am {}, I've been immutably borrowed", borrowed.namefn());
    Ok(())
}

fn main() -> Result<()>{
    let our_player = Player { name: "Jones".to_string(), age: 25, description: "Just a happy guy.".to_string() };
    immutable_borrow(&our_player);
    println!("My name is {}, and I am being used after an immutable borrow", our_player.namefn());

    let res = reqwest::blocking::Client::new().post("http://httpbin.org/anything").send()?.error_for_status()?;
    immutable_borrow_nok(&res);
    println!("I am also some json but I *do* work... {:#?}", res.text());

    Ok(())
}

会将右边列表中的值注入到左边的Print []调用中。

从形式上看，Slot []函数的定义确实有用。

＃和＆符号在mathematica中表示什么？

1 个答案: