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 plotting a integral function.		  New Topic  Reply to Topic
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Balaram

2 Posts
Posted - 12/07/2018 :  12:51:10 AM  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:
I am trying to generate an integral curve as follows:
Y(x)= A integral [ L(B*x*t^3)*f(t)dt]
integral is from 0 to infinity,
L: Langevin function { L(b)=coth(b)-1/b}
f(t): log normal distribution function
{ f(t) = [exp(-((ln(t))^2)/2k^2)]/[sqrt(2*pie)*k*t] }
K is a constant
I am using origin 9.0, but I am not able to generate the above said function.

Please help.

Thanks in advance..

AmandaLu

439 Posts
Posted - 12/07/2018 :  01:38:30 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi

To define a fitting function with integral, please refer to the following tutorial:

https://www.originlab.com/doc/Tutorials/Fitting-Integral-LabTalk

Thanks,
Amanda
OriginLab Technical Service
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Balaram

2 Posts
Posted - 12/27/2018 :  11:23:05 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
while giving the limits from 0 to inf,
and executing for x=1, y is coming -1.72E-297
and it is showing
undefined variable:inf.
I had tried to generate the equation which is given in Tutorial but it is showing the same problem.

Please help,
Thanks in advance,
Balram
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AmandaLu

439 Posts
Posted - 12/28/2018 :  03:44:01 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

I cannot reproduce the error here. Could you please send your project file to tech@originlab.com so we can check? Please include your serial number and refer to this post.

Thanks,
Amanda
OriginLab Technical Service
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