Since I don't know what "areas" is, it is not possible for me to try to run your code.
However, I notice that you wrote, for example,
>> exp.^-b
That is not correct MATLAB syntax. exp() is a function that requires an argument; it is not the value "e". So, I am guessing you meant maybe
>> exp(-b*x)
but I am not quite sure.
ADDED LATER:
Here is a snippet of code in which I took your attempt, and changed several things to make it function.
- I put in some random exponential data
- I reordered your a and b variables as input, because I think you had them switched
- I put the fitting parameters into one vector
So, this works, but you definitely need to see if it is close to what you want to do.
x = exprnd(1,[100000 1]);
[a,b]=hist(x,30);
mdl=@(ab,x)(ab(1)*exp(-x*ab(2)));
ab0=[1;0];
nlintool(b,a,mdl,ab0)
