12.21.5. - Referring to parameters
The internal storage of parameters and related values are in the structure
array named
fpar, defined in
p_fitsize.h.
The next lines
show how to refer to the parameters in your model equation.
#define CONST fpar[0].p_b
#define fCONST fpar[0].p_fit
#define dCONST fpar[0].p_p
#define LINEAR fpar[1].p_b
#define fLINEAR fpar[1].p_fit
#define dLINEAR fpar[1].p_p
The purpose of the above definitions is to make referencing the current
values of the parameters convenient.
The structure member
fpar[i].p_b indicates the current value of the
i-th
parameter.
The other
two members are relevant generally only when you are supplying the
analytic derivatives for the corresponding parameter.
In such a case
fpar[i].p_fit indicates the parameter is currently being fit
and
fpar[i].p_p is the variable to which you assign the value
of the derivative.
Their use is made clear below.
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