help in single exponential fitting

Hello,

I am kind new in using Matlab. I am trying to do a single exponential
fitting.
I used 'fit', however the fitting result is not good.
Then used 'fminsearch' but it dosen't gave the errors of the fitting
parameters.
Can anybody recommend a fitting function or method that is good in
single exponential fitting and gives the errors of parameters.

Thanks a lot.
.

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