Problem 45189. Double Factorial

Created by Mehmet OZC

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Return double factorial</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[        n(n-2)...(5)(3)(1),   n>0, odd\nn!!  =  n(n-2)...(6)(4)(2),   n>0, even\n        1                 ,   n = -1, or n = 0]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For example</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>6!! = (6)(4)(2) = 48</w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

79 Solutions
26 Solvers

Last Solution submitted on Oct 21, 2020

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

Atsushi Ueno on 17 Nov 2019

Neither n = -1, nor n = 0 are tested.

Problem Recent Solvers26

Problem Tags

double factorial factorial number theory

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 45189. Double Factorial

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers26

Suggested Problems

More from this Author62

Problem Tags

Community Treasure Hunt

Problem 45189. Double Factorial

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers26

Suggested Problems

More from this Author62

Problem Tags

Community Treasure Hunt

Players