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 |
fitting an integral equation
Posted - 09/30/2015 : 11:32:13 AM
