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T O P I C R E V I E W
Ted13	Posted - 11/03/2014 : 8:16:10 PM Origin Ver 8. Hello, I want to find the radius of curvature of those two peeks. thanks
2 L A T E S T R E P L I E S (Newest First)
Hideo Fujii	Posted - 11/04/2014 : 3:58:09 PM Hi, Also, you may want to see this post as a related issue: http://www.originlab.com/forum/topic.asp?TOPIC_ID=19115 It seems that your data needs to be applied some sort of smoothing before calculating the curvature. --Hideo Fujii OriginLab
JacquelineHe	Posted - 11/04/2014 : 04:06:50 AM Hi, I search and found the equation in wiki. http://en.wikipedia.org/wiki/Radius_of_curvature_(mathematics) Note: you need to copy-paste the above full link to open the page. If this is what you want, you can calculate the first and second derivative values with our differentiate tool and use Set Column Value dialog to calculate the radius of curvature values according to the equation. About Set Column Value dialog, please refer to this pages: http://www.originlab.com/doc/Tutorials/SetColVal http://www.originlab.com/Index.aspx?go=Support/VideoTutorials&pid=1166 Thanks Jacqueline OriginLab

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