Complex

struct Complex

• Complex
• Struct
• Value
• Object

Overview

A complex number is a number represented in the form a + bi. In this form, a and b are real numbers, and i is an imaginary number such as i² = -1. The a is the real part of the number, and the b is the imaginary part of the number.

require "complex"

Complex.new(1, 0)   # => 1.0 + 0.0i
Complex.new(5, -12) # => 5.0 - 12.0i

Defined in:

Class Method Summary

• .new(real : Number, imag : Number)
• .zero : Complex

  Returns the number 0 in complex form.

Instance Method Summary

• #*(other : Complex)

  Multiplies self by other.

• #*(other : Number)

  Multiplies self by other.

• #+(other : Number)

  Adds the value of self to other.

• #+(other : Complex)

  Adds the value of self to other.

• #-

  Returns the opposite of self.

• #-(other : Number)

  Removes the value from other to self.

• #-(other : Complex)

  Removes the value from other to self.

• #/(other : Number)

  Divides self by other.

• #/(other : Complex)

  Divides self by other.

• #==(other : Complex)

  Determines whether self equals other or not.

• #==(other : Number)

  Determines whether self equals other or not.

• #==(other)

  Determines whether self equals other or not.

• #abs

  Returns the absolute value of this complex number in a number form, using the Pythagorean theorem.

• #abs2

  Returns the square of absolute value in a number form.

• #clone
• #conj

  Returns the conjugate of self.

• #exp

  Calculates the exp of self.

• #imag : Float64

  Returns the image part of self.

• #inspect(io : IO)

  Write this complex object to an io, surrounded by parentheses.

• #inv

  Returns the inverse of self.

• #log

  Calculates the log of self.

• #log10

  Calculates the log10 of self.

• #log2

  Calculates the log2 of self.

• #phase

  Returns the phase of self.

• #polar

  Returns a tuple with the abs value and the phase.

• #real : Float64

  Returns the real part of self.

• #sign
• #sqrt

  Complex#sqrt was inspired by the following blog post of Pavel Panchekha on floating point precision.

• #to_s(io : IO)

  Write this complex object to an io.

Class Method Detail

Instance Method Detail

Complex.new(42, 2).abs  # => 42.047592083257278
Complex.new(-42, 2).abs # => 42.047592083257278

Complex.new(42, 2).abs2 # => 1768

Complex.new(42, 2).conj  # => 42.0 - 2.0i
Complex.new(42, -2).conj # => 42.0 + 2.0i

Complex.new(4, 2).exp # => -22.720847417619233 + 49.645957334580565i

Complex.new(42, 2).inspect # => "(42.0 + 2.0i)"

Complex.new(42, 2).polar # => {42.047592083257278, 0.047583103276983396}

Complex.new(42, 2).to_s # => "42.0 + 2.0i"