Project

General

Profile

Actions
Copy link

Feature #2322

closed

[PATCH] Add standard deviation function to Math Module

Added by danielc192 (Daniel Cohen) over 14 years ago. Updated about 12 years ago.

Status:
Rejected
Assignee:
mrkn (Kenta Murata)
Target version:
2.0.0
[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 open — 1 closed)

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

Updated by znz (Kazuhiro NISHIYAMA) about 14 years ago

  • Target version set to 2.0.0

=begin

=end

Actions
Copy link
 #2 [ruby-core:43388]

Updated by nahi (Hiroshi Nakamura) about 12 years ago

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

Updated by shyouhei (Shyouhei Urabe) about 12 years ago

  • Status changed from Open to Assigned
Actions
Copy link
 #4 [ruby-core:43476]

Updated by mrkn (Kenta Murata) about 12 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

Actions
Copy link

Also available in: Atom PDF

Like0
Like0Like0Like0Like0