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Feature #2322

closed

[PATCH] Add standard deviation function to Math Module

Added by danielc192 (Daniel Cohen) about 15 years ago. Updated over 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
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 #1

Updated by znz (Kazuhiro NISHIYAMA) over 14 years ago

  • Target version set to 2.0.0

=begin

=end

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 #2 [ruby-core:43388]

Updated by nahi (Hiroshi Nakamura) over 12 years ago

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

Updated by shyouhei (Shyouhei Urabe) over 12 years ago

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

Updated by mrkn (Kenta Murata) over 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

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