Last Update: 2/3/2015
For an exponential function exp(x), Origin will return missing value when the independent variable x is greater than 665.
In order to get the fit converge, you need to redefine the equations to avoid the x variable value of the exp(x) function from greater than 665.
1) You can take natural logarithm for both sides of equation.
2) If your function has expression in the form of exp(x1)*exp(-x2), you can transform it as exp(x1-x2)
Keywords:curve fitting, fitting error, exponential function