| T O P I C R E V I E W |
| timothy.v.duncan |
Posted - 03/04/2010 : 1:00:21 PM
Origin Ver. and Service Release (Select Help-->About Origin): 8.1 SR1
Operating System: XP SP3
I would like to fit to a function of the form:
y(x) = C*(x)^(-0.5) * SUM [-(D/x)*(2*n+1)^2]
where C and D are the fitting parameters and the summation is over n from zero to infinity.
I am not really sure how to proceed. I've done simple user-defined functions before but I guess the summation is sort of throwing me off here. Any suggestions would be welcome. |
| 4 L A T E S T R E P L I E S (Newest First) |
| larry_lan |
Posted - 03/07/2010 : 8:55:29 PM
This example already shows how to do semi-infinite integration. You can define similar function like that using a different terminate condition. Or you can also call a NAG function to do infinite integration. Like this example that calls nag_1d_quad_inf_1 function to do one-dimensional adaptive quadrature over infinite or semi-infinite interval.
Thanks
Larry |
| timothy.v.duncan |
Posted - 03/05/2010 : 10:28:37 AM
Thanks for the link. However (and please correct me if I'm wrong), this appears to be a method for integration, when I need a method for an infinite summation. |
| larry_lan |
Posted - 03/04/2010 : 8:31:55 PM
Maybe this example can help.
Thanks
Larry
OriginLab Technical Services |
| timothy.v.duncan |
Posted - 03/04/2010 : 1:03:09 PM
Forgive me, the correct function is
y(x) = C*(x)^(-0.5) * SUM [exp(-(D/x)*(2*n+1)^2)] |
