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I have some data that is curve fitting nicely using custom equation from cftool. The equation is: y = aexp(-bx)+c. Is there any way to make this same equation available from the command line? For instance using fit command and exp1 gives following results:

f = fit(time,T102,'exp1')

f = 

 General model Exp1:
 f(x) = a*exp(b*x)
 Coefficients (with 95% confidence bounds):
 a = 0.0726 (0.0717, 0.0735)
 b = -1.263e-05 (-4.171e-05, 1.645e-05)

However the form of this equation does not fit my data well. I need to have the equation as f(x) = aexp(bx) + c. I am aware that I can get it from cftool but I have many different sets of data to curve fit (~30) and I just want a, b, and c returned from by MATLAB in the custom equation f(x) = aexp(bx) + c.

I ended up finding my answer using information from following link:
https://www.mathworks.com/help/curvefit/fit.html

1. 
   

   Create a matlab function that contains custom equation for fit

   
   
   

   function y = CustomCurveFitFunction(x,a,b,c)

   
   
   

   y = aexp(-bx) + c;

   
   
   

   end

   
   


2. 
   

   Call the function in the following manner from MATLAB

   
   
   

   ft = fittype('CustomCurveFitFunction(x, a, b, c)');

   
   
   

   f = fit(time, y, ft);