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T O P I C    R E V I E W
Sumeet kumar Posted - 06/23/2019 : 10:01:56 AM
I am trying to fit data to a function having six parameters and a constant. I entered the values of the constant and parameters to check whether the function is working or not. But I got different values from the function from Origin than from Matlab. I have attached Matlab code below in which in the lower comment, I directly copied and pasted the function written in Origin.

clear; clc;

n2 = 3;
k2 = 0.1;
n3 = 4;
k3 = 2.5;
kp = 1e-18;
t0 = 600;

lam = 1.625e-6;
t = 0;

y = 1 - abs((((1-n2)+i*k2)*((n2+n3)-i*(k2+k3))+((n2-n3)-i*(k2-k3))*((1+n2)-i*k2) ...
*exp(4*pi*sqrt(kp*(t+t0))*(-k2-i*n2)/lam))/(((1+n2)-i*k2)*((n2+n3) ...
-i*(k2+k3))+((1-n2)+i*k2)*((n2-n3)-i*(k2-k3))*exp(4*pi*sqrt(kp*(t+t0))*(-k2-i*n2)/lam)))^2

%y = 1 - abs( ( ( ( 1 - n2 ) + 1i * k2 ) * ( ( n2 + n3 ) - 1i * ( k2 + k3 ) ) + ( ( n2 - n3 ) - 1i * ( k2 - k3 ) ) * ( ( 1 + n2 ) - 1i * k2 ) * exp( 4 * pi * sqrt( kp * ( t + t0 ) ) * ( -k2 - 1i * n2 ) / lam ) ) / ( ( ( 1 + n2 ) - 1i * k2 ) * ( ( n2 + n3 ) - 1i * ( k2 + k3 ) ) + ( ( 1 - n2 ) + 1i * k2 ) * ( ( n2 - n3 ) - 1i * ( k2 - k3 ) ) * exp( 4 * pi * sqrt( kp * ( t + t0 ) ) * ( -k2 - 1i * n2 ) / lam ) ) )^2

Thanks all
2   L A T E S T    R E P L I E S    (Newest First)
Sumeet kumar Posted - 06/25/2019 : 06:15:26 AM
Thanks for the reply.

I got a mail from the technical team of Origin in which following suggestions were given.

If you write the fitting function in LabTalk, please use "imabs" instead of "abs", "imexp" instead of "exp".

If you write the function in OriginC, please use "cabs" instead of "abs". "exp" can work for complex number in OC.

When I implemented those changes, then it is working fine.
Castiel Posted - 06/23/2019 : 10:24:42 PM
quote:
Originally posted by Sumeet kumar

I am trying to fit data to a function having six parameters and a constant. I entered the values of the constant and parameters to check whether the function is working or not. But I got different values from the function from Origin than from Matlab. I have attached Matlab code below in which in the lower comment, I directly copied and pasted the function written in Origin.

clear; clc;

n2 = 3;
k2 = 0.1;
n3 = 4;
k3 = 2.5;
kp = 1e-18;
t0 = 600;

lam = 1.625e-6;
t = 0;

y = 1 - abs((((1-n2)+i*k2)*((n2+n3)-i*(k2+k3))+((n2-n3)-i*(k2-k3))*((1+n2)-i*k2) ...
*exp(4*pi*sqrt(kp*(t+t0))*(-k2-i*n2)/lam))/(((1+n2)-i*k2)*((n2+n3) ...
-i*(k2+k3))+((1-n2)+i*k2)*((n2-n3)-i*(k2-k3))*exp(4*pi*sqrt(kp*(t+t0))*(-k2-i*n2)/lam)))^2

%y = 1 - abs( ( ( ( 1 - n2 ) + 1i * k2 ) * ( ( n2 + n3 ) - 1i * ( k2 + k3 ) ) + ( ( n2 - n3 ) - 1i * ( k2 - k3 ) ) * ( ( 1 + n2 ) - 1i * k2 ) * exp( 4 * pi * sqrt( kp * ( t + t0 ) ) * ( -k2 - 1i * n2 ) / lam ) ) / ( ( ( 1 + n2 ) - 1i * k2 ) * ( ( n2 + n3 ) - 1i * ( k2 + k3 ) ) + ( ( 1 - n2 ) + 1i * k2 ) * ( ( n2 - n3 ) - 1i * ( k2 - k3 ) ) * exp( 4 * pi * sqrt( kp * ( t + t0 ) ) * ( -k2 - 1i * n2 ) / lam ) ) )^2

Thanks all

abs, exp, sqrt etc. does not support complex number in Origin.
You can handle the real part and the imaginary part separately.


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