Is fixing (holding) fitting parameters the same as writing directly their values in function?
Mon, 04/22/2019 - 11:52 am
Could you please tell me, is fixing (holding) some parameters in fitting function equivalent to direct writing the values of these parameters in the expression of fitting function?
For example, I generated data using:
'1' = exp(-(p-60)^2/50)
In the first case, I have fitting function:
Let's designate w=a, w=b, w=c.
I set initial guess for first two parameters: a_0=1, b_0 = 55. And I hold the third parameter: c = 5.
In the second case, I create the following fitting function:
Thus, instead of parameter c, I wrote the exact constant value 5.
The question is: are these two cases equivalent to each other in sense of fitting procedure? Are these cases the same for Igor Pro? Or the first case is more difficult in sense of calculation?