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 fitting a function consisting of two components		  New Topic  Reply to Topic
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hydrix

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Posted - 04/10/2007 :  11:41:39 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System: XP
hi everyone,
id like to fit the function
y=((P2*P4+P1*P3)*x-0.5*(P2+P1)*x^2)+554.27, if x<P3
y=((P2*P4)*x-0.5*P2*x^2+0.5*P1*P3^2)+554.27, if P4>x>P3
to a set of data points.
can anyone tell me if this is possible and how this works?
thank you for help

zachary_origin

China
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Posted - 04/10/2007 :  9:29:37 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
you need create a user-defined fitting function (if you are not familiar, seethis for help).

As for your function, it will be defined as something like (make sure the checkbox Use OriginC is checked):

if(x<P3)
   y=...;
else if (P3<x && x<P4)
   y=...;
else
   y=...;
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