How can I adjust and extract the distribution function parameters in fitdist

I am using histfit to fit an exponential function to a histogram of values that I have. To do this, histfit uses fitdist, but the default exponential function it uses i believe is of the form , where the only parameter I can retrieve from the fit is Mu. For my data, I basically need the decay constant which would be 1/mu but there is also a background vertical and horizontal offset, how could I add these parameters into the fit to give a more accurate result? Also is there a way to store the parameters as separate variables for later use?

[dpb]

You would have to fit a custom model to incorporate the other terms.

You can retrieve the coefficients as well as other info from a fit object, yes.

[Dheeraj Singh]

Have a look at mle for a custom distribution:

https://in.mathworks.com/help/stats/mle.html