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Feature #2322

closed

[PATCH] Add standard deviation function to Math Module

Added by danielc192 (Daniel Cohen) over 12 years ago. Updated about 10 years ago.

Status:
Rejected
Priority:
Normal
Target version:
[ruby-core:26473]

Description

=begin
This patch adds a Standard Deviation function to the Math Module. It takes an array and finds the standard deviation of all its elements, as long as they are numbers.
=end


Files

add_stdev.diff (982 Bytes) add_stdev.diff Patch to add standard deviation feature danielc192 (Daniel Cohen), 11/02/2009 05:29 AM

Related issues 1 (0 open1 closed)

Related to Ruby master - Feature #2321: [PATCH] Array Module sum and mean featuresRejected11/01/2009Actions
Actions #1

Updated by znz (Kazuhiro NISHIYAMA) about 12 years ago

  • Target version set to 2.0.0

=begin

=end

Updated by nahi (Hiroshi Nakamura) about 10 years ago

  • Description updated (diff)
  • Assignee set to mrkn (Kenta Murata)
Actions #3

Updated by shyouhei (Shyouhei Urabe) about 10 years ago

  • Status changed from Open to Assigned

Updated by mrkn (Kenta Murata) about 10 years ago

  • Status changed from Assigned to Rejected

Why do we need to specially treat the 2nd central moment, that is standard deviation, than the other nth moment, such as skewness (3rd) and kurtosis (4th)?

You can use NArray for that reason. See http://narray.rubyforge.org/index.html.en

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