Fitting a function to data

2016 2 3
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Hello all,
I got the following function:
function y=decay(t,C1,C2,n,t1,t2)
y=C1+(C2-C1)*exp(-n*(t-t1));
itu=find(t<t1 | t>t2);
y(itu)=NaN;
I want to fit this curve on data that I obtained using matlab. However I don't succeed in using the optimization toolbox. Furthermore I don't think it is possible to use the curve fitting toolbox for this. Can anyone help me with this issue?
Kind regards, Rob

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