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 Extrapolation of a curve

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T O P I C    R E V I E W
mohamed1986 Posted - 06/16/2014 : 2:26:00 PM
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
2   L A T E S T    R E P L I E S    (Newest First)
mohamed1986 Posted - 06/17/2014 : 12:38:08 PM
Thanks much for your help
lkb0221 Posted - 06/16/2014 : 2:48:22 PM
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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