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 Fitting function Integrating out a variable		  New Topic  Reply to Topic
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kpisane

2 Posts
Posted - 04/15/2014 :  4:52:29 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 9
Operating System: Windows 7

Hello, I am having trouble with a fitting function I have been trying to write for my data analysis:

I have a plot of x and y=f(x) that I need to fit, but there is a catch:
y=f(x)=Integral[g(x,z)] where I integrate the function from z=0 through infinity so that the result only depends directly on x.

The integral cannot be solved analytically which is where my problem comes in. I can perform the integral using d01smc from the NAG library for a constant value of x, but my result plots as a function of z. Alternatively, I am able to get a function that will simulate the result as a function of x and z (3D plot), but this function cannot be used for fitting to my data.

Is there a way to integrate over z and plot/fit against x?
Edited by - kpisane on 04/16/2014 10:22:20 AM

JessieWoo

China
46 Posts
Posted - 04/17/2014 :  03:36:12 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Kelly,

Please send us your fitting function with a brief description and some sample data.
You can follow the instruction in the link below to send us file.
http://www.originlab.com/index.aspx?go=Support&pid=752

Best Regards,
Jessie
OriginLab Corp.
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kpisane

2 Posts
Posted - 04/17/2014 :  11:07:51 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I have sent the requested information and files. I look forward to any advice you may be able to give me.
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