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academic76
France
1 Posts |
 Posted - 12/09/2016 : 04:03:38 AM
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Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2017 -version assay
Operating System: windows 7
I have read a publication from 2010 (doi:10.1039/b9nj00498j) and I would like to estimate parameters : K1,K2,G1,G2. G1,Mt are constants, G, a dependent variable (from experimental measurements) and Lt, independent variable. The code was written like that :
double a;
a=K1*K2;
double b;
b=K1-a*(Lt+2*Mt);
double c;
c=1*K1*(Mt-Lt);
double d;
d=-Lt;
for (L=Lt,step=1;abs(step)>1e-15;L=L-step)
{step=(a*L*L*L+b*L*L+c*L+D)/(3*a*L*L+2*b*L+c);};
G=(Gs+G1*K1*L+G2*K1*K2*L*L)/(1+K1*L+K1*K2*L*L)
But it seems that the step function does not work. It allows to calculate square roots from a polynomial function (degree 3) (aL^3+bL^2+cL+d=0) by the Newton-Raphson procedure and then use L to calculate G.
Could you help me to re-write, in the originPro 2017 version, something that would work...
Thank you for your help.javascript:insertsmilie(' ')
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yuki_wu
896 Posts |
Posted - 12/10/2016 : 02:23:17 AM
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Hi,
Do you mean your fitting function doesn’t work in Origin 2017?
Did you get any error message or you just get the wrong fitting data?
In order to figure out what went wrong, I think you’ better send your definition file (*.FDF) to us. You can find this file in your User Files Folder(UFF), which can be found from:
Windows START menu> Programs>OriginLab> Origin 2017> User Files Folder> fitfunc.
To contact us, please go to this page:
http://www.originlab.com/index.aspx?go=COMPANY/ContactUS
Regards,
Yuki
OriginLab
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step function in originlab 2017