Error using fittype for custom function
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Hi I would like to fit a custom defined function (not continuous) to experimental time series data. My problem is that fittype does not accept my function although the function itself works fine and the syntax worked for similar functions. below you will find the fittype command I use, the error and the function that I would like to fit. Thank you in advance for any suggestions.
Lorenz
fittype command: ft1=fittype('Exp_delay_v2(t, tau1, tau2, a, b, dt1, dt2)','independent','t','coeff',{'tau1','tau2','a','b','dt1','dt2'});
Error using fittype>iCreateFittype (line 368) Expression Exp_delay_v2(t, tau1, tau2, a, b, dt1, dt2) is not a valid MATLAB expression, has non-scalar coefficients, or cannot be evaluated: Error in fittype expression ==> Exp_delay_v2(t, tau1, tau2, a, b, dt1, dt2) ??? Index exceeds matrix dimensions.
function y = Exp_delay_v2(t, tau1, tau2, a, b, dt1, dt2)
y=zeros(size(t));
s = 10.8*200;
d1=dt1*200;
d2=dt2*200;
t1a = t(1:s-d2);
t1b = t(s-d2+1:2*s-d2+d1);
t2 = t(1:2*s-d1+d2);
y(1:s+d1) = ( (a+b) - b.*(1-exp(-(t1b)./tau2)) );
y(s+1+d1:3*s+d2) = ( a + b.*(1-exp(-(t2)./tau1)) );
y(3*s+d2+1:end) = ( (a+b) - b.*(1-exp(-(t1a)./tau2)) );
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Lorenz
2013-10-24
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1 个评论
Peter Reader
2016-8-8
Can you provide an exact solution to this? I have the same problem!
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ran
2013-10-31
0 个投票
Hi, I'm not sure I got what you meant. I want to have a custom function with many parameters, how should I do it?
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