| T O P I C R E V I E W |
| analytik |
Posted - 09/13/2004 : 10:32:46 AM
Origin Version (Select Help-->About Origin): Origin 6.0
Operating System: win2000
Hello everybody!
I would like to ask for help with nonlinear curve fitting where I have two Y datasets and I would like to provide simultaneously fit to two different equations.
my problem:
y_1=P1*x_1+((P2*P3*x_1)/(1+(P3*x_1)+(P4*x_1)))
y_2=P1*x_2+((P2*P4*x_2)/(1+(P3*x_2)+(P4*x_2)))
To obtain meaningful paramaters I have to apply the following constraints:
P1+P2*P3=const1;
P1+P2*P4=const2
of course the const1 & const2 are real numbers as for example: 3.1, 3.2.The Origin is responding with error message that constraints are illegal. Is there any possibility in Origin, how to solve this problem.
Thank you very much.
Analytik
Edited by - analytik on 09/22/2004 11:56:37 AM |
| 3 L A T E S T R E P L I E S (Newest First) |
| analytik |
Posted - 10/07/2004 : 09:51:48 AM
Hi,
Thank you very much for your answer and I appreciate for the same. I have already found out what kind of constraints the Origin is accepting and by this way I have expressed my equations and I succeeded. Thank you very much for help.
analytik
quote:
Hi Analytik,
Currently only linear constraints are accepted by the fitter. Since your constraints are nonlinear, it is not possible to fit with them.
Easwar
OriginLab
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| easwar |
Posted - 09/28/2004 : 10:07:30 AM
Hi Analytik,
Currently only linear constraints are accepted by the fitter. Since your constraints are nonlinear, it is not possible to fit with them.
Easwar
OriginLab
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| cgbin |
Posted - 09/28/2004 : 09:00:37 AM
hi
this problem is easy ,you can use The Layer Tool to resolve this question.y1 is set in the first layer and y2 is set in the second layer. |
