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T O P I C    R E V I E W
ouss Posted - 11/18/2014 : 1:01:50 PM
Hello Everyone !

My problem is how to create a new fit builder of this function ?

f(x)= [a0*(1-exp(-2(x/W)^2 ))+a1*(1-exp(-2x^2 )(1+4(x/W)^4))+a2*(1-exp(-2(x/W)^2 )(1+8(x/W)^4-8(x/W)^6+4(x/W)^8))]

I tried to create it but i think the problem is in the defining parameters.
The expression of the function is well compiled, if anyone of you could give me the instructions please !
Thank YOU !!
2   L A T E S T    R E P L I E S    (Newest First)
ouss Posted - 11/22/2014 : 5:08:34 PM
Hello

thank you Fujii
Hideo Fujii Posted - 11/19/2014 : 10:32:50 AM
Hi ouss,

There are a few minor mistakes (e.g., cannot use [...], but (...) can be; need '*' for multiplication), and the following function form should work in the Fitting Function Builder tool:
Function Type: Origin C
Parameters: a0,a1,a2,W
Function body:
 y=(a0*(1.0-exp(-2.0*(x/W)^2 ))+a1*(1.0-exp(-2.0*x^2 )*(1.0+4.0*(x/W)^4))+a2*(1.0-exp(-2.0*(x/W)^2 )*(1.0+8.0*(x/W)^4-8.0*(x/W)^6+4.0*(x/W)^8)))
Hope this helps.

--Hideo Fujii
OriginLab

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