class Dataframe::Column(T)

• Dataframe::Column(T)
• Reference
• Object

Overview

Column represents a column of values in a Dataframe, cast to one of the Dataframe types (Dataframe::Type).

NOTE: The most common method to get a Column is from Dataframe#columns, which returns a union of all possible types, thus making it necessary to cast the column as the proper type before running any type specific methods.

column = dataframe.columns["Age"].as(Dataframe::Column(Int32))

column.map! do |e|
  e.nil? ? e : e + 1
end

Defined in:

column.cr

Constructors

• .new(new_data : Array(Type))

  Creates a Column from the values in new_data.

• .new

  Creates an empty Column.

Instance Method Summary

• #==(other : Column) : Bool

  Equality.

• #[](index : Int32)

  Returns the element at the given index.

• #avg : Float64

  Returns the average of all non-nil elements of self.

• #map(& : T | Nil -> T | Nil) : Column(T)

  Returns a Column with the results of running the block against each element of the collection.

• #map!(& : T | Nil -> T | Nil) : self

  Invokes the given block for each element of self, replacing the element with the value returned by the block.

• #max(*args, **options)
• #max(*args, **options, &)
• #min(*args, **options)
• #min(*args, **options, &)
• #mode : Array(T)

  Returns the most non-nil element of highest frequency in self.

• #size(*args, **options)
• #size(*args, **options, &)
• #sum : T

  Returns the sum of all non-nil elements of self.

• #to_a : Array(T | Nil)

  Returns an Array containing the elements of self.

• #to_s(io : IO) : Nil

  Prints a nicely readable and concise string representation of this Column to io.

• #unsafe_fetch(index : Int) : T | Nil
• #unsafe_put(index : Int, value : T)

Constructor Detail

Instance Method Detail