Module peroxide::structure::vector

Extra tools for Vec<f64>

Print Vec<f64>

• There are two ways to print vector

  • Original way: print!("{:?}", a);
  • Peroxide way: a.print(); - Round-off to fourth digit

  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = vec![2f64.sqrt()];
      a.print(); // [1.4142]
  }

Syntactic sugar for Vec<f64>

• There is useful macro for Vec<f64>

• For R, there is c

  a = c(1,2,3,4)

• For Peroxide, there is c!

  // Rust
  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
  }

From ranges to Vec

• For R, there is seq to declare sequence.

  a = seq(1, 4, 1)
  print(a)

• For peroxide, there is seq to declare sequence.

  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = seq(1, 4, 1);
      a.print();
      // [1, 2, 3, 4]
  }

Vec Operation

There are two ways to do vector operations.

• Use functional programming tools
• Use redox

Here, I explain second method - for functional programming, see below.

To use redox, you only need to understand two things - ox(), red().

• ox() : Makes vector to Redox<T: Vector>
• red() : Makes Redox<T: Vector> to vector.

#[macro_use]
extern crate peroxide;
use peroxide::fuga::*;

fn main() {
    let a = c!(1, 2, 3);
    assert_eq!((a.ox() * 2f64 - 1f64).red(), c!(1f64, 3f64, 5f64));
}

Concatenation

There are two concatenation operations.

• cat(T, Vec<T>) -> Vec<f64>

• concat(Vec<T>, Vec<T>) -> Vec<T>

  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
      cat(0f64, &a).print();
      // [0, 1, 2, 3, 4]
  
      let b = c!(5,6,7,8);
      concat(&a, &b).print();
      // [1, 2, 3, 4, 5, 6, 7, 8]
  }

Conversion to Matrix

There are two ways to convert Vec to matrix.

• into(self) -> Matrix : Vec to column matrix

  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
      let a_col: Matrix = a.into();
      let m_col = matrix(c!(1,2,3,4), 4, 1, Col); // (4,1) Matrix
      assert_eq!(a_col, m_col);
  
      let m_row = matrix(c!(1,2,3,4), 1, 4, Row); // (1,4) Matrix
      assert_eq!(a_col.t(), m_row);
  }

Functional Programming {#functional}

FP for Vec

• There are some functional programming tools for Vec<f64>

fmap

• fmap is syntactic sugar for map

• But different to original map - Only f64 -> f64 allowed.

  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
  
      // Original rust
      a.clone()
          .into_iter()
          .map(|x| x + 1f64)
          .collect::<Vec<f64>>()
          .print();
          // [2, 3, 4, 5]
  
      // fmap in Peroxide
      a.fmap(|x| x + 1f64).print();
      // [2, 3, 4, 5]
  }

reduce

• reduce is syntactic sugar for fold

  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
  
      // Original rust
      a.clone()
          .into_iter()
          .fold(0f64, |x, y| x + y)
          .print(); // 10
  
      // reduce in Peroxide
      a.reduce(0f64, |x, y| x + y).print(); // 10
  }

zip_with

• zip_with is composed of zip & map

  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
      let b = c!(5,6,7,8);
  
      // Original rust
      a.clone()
          .into_iter()
          .zip(&b)
          .map(|(x, y)| x + *y)
          .collect::<Vec<f64>>().print();
          // [6, 8, 10, 12]
  
      // zip_with in Peroxide
      zip_with(|x, y| x + y, &a, &b).print();
      // [6, 8, 10, 12]
  }

filter

• filter is just syntactic sugar for filter

  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
      a.filter(|x| x > 2f64).print();
      // [3, 4]
  }

take & skip

• take is syntactic sugar for take

  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
      a.take(2).print();
      // [1, 2]
  }

• skip is syntactic sugar for skip

  #[macro_use]
  extern crate peroxide;
  use peroxide::fuga::*;
  
  fn main() {
      let a = c!(1,2,3,4);
      a.skip(2).print();
      // [3, 4]
  }

Functions

map

Explicit version of map

reduce

Explicit version of reduce

zip_with

Explicit version of zip_with