Last Update: 9/21/2017
When you do curve fitting, you might meet these problems:
In both cases, we need to redefine the equations to avoid a very large or a very small parameter. For example:
Another actual example is the nonlinear implicit diode function:
, k is in as a unit.
To do fitting with this function, firstly, we can reset the parameter to , where , then the parameter won't be too small.
In this way, we can avoid the very small parameter and finally get the fit converge.
Keywords:good fit, not converge, missing value in standard error,diode function