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 fitting an integral equation

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T O P I C    R E V I E W
friedman Posted - 09/30/2015 : 11:32:13 AM
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2015
Operating System: Mac with crossover

I have been having trouble fitting with an user defined integral equation despite following the instructions posted on the origin website. When I try to fit with my equation, it crashes my software. Here are the steps that I followed:

Integrand Name: fourT
Integration variable: t
arguments: iD, iL, iB, its, iA
return exp(-iL^2/(4*iD*t))*cos(iA*iB*t)*exp(-t/its)/sqrt(4*PI*iD*t)

Independent variables: B
dependent variables: y
parameters: S0, ts, D, L
constants: A

Parameters: lower limit=0, upper limit=inf, iD=D, iL=L, iB=B, its=ts, iA=A
Constants: A= 17597723
y=S0*integral(fourT, 0, inf, D,L,B,ts,A)

The quick check seems to work. What am I doing wrong?

Thanks
1   L A T E S T    R E P L I E S    (Newest First)
lkb0221 Posted - 10/06/2015 : 09:58:52 AM
Try use NAG func d01smc

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