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 Extrapolation of a curve		  New Topic  Reply to Topic
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mohamed1986

43 Posts
Posted - 06/16/2014 :  2:26:00 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System: origin 9.1
Dear friends,
Kindly, I need to extrapolate a line of the scattered points in the attached picture to intersect with the line in the graph


I want to have the following extrapolation



Thanks much

lkb0221

China
497 Posts
Posted - 06/16/2014 :  2:48:22 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Because the line in your graph is just Y=X so here is a easy way to do this: (Assume your scatter is Col(A)-X and Col(B)-Y)

1). Create Col(C)=Col(B)-Col(A)
2). Do a linear fit on Col(C), find the value at Y=0. (Find X be Y)

The intersection point should be around 420

Or:

1). Directly do a linear fit for your scatter on the graph
2). Use Intersection gadget to find the point.

Zheng
OriginLab
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mohamed1986

43 Posts
Posted - 06/17/2014 :  12:38:08 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks much for your help
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