12.6. - fi fit the data points
starts the fitting algorithm using the current data.
fi [[+|-] # ...] [p#=value ...] [n=value] [f#=value] [t#=value] [L#=value|none ...] [U#=value|none ...]All the options to
fi can be selected using other commands.
Single numbers, represented by
#,
indicate which parameters
to vary.
In addition,
+# means add parameter
#
to
the ones being fitted, while
-# means don't fit parameter
#.
The
vp command also can be used to select the parameters
to vary.
Values for fixed parameters and initial values for fitted
parameters can be set using the
p#=value syntax,
where the
#
represents the parameter number.
The
gp command
can be used to enter the same information.
The maximum number of iterations is set using
n=value.
This
value also can be set using the
fc command.
You can set the range of the independent variables using the
ra command or you can choose the range for each independent variable
by entering
f#=value
to set the lower limit for independent
variable number
#
and
t#=value
to set
the upper limit.
You can set only the from-value or only the to-value
if you like.
If
#
is not specified, independent variable
number 1 is used.
Parameter constraints can be set with the
lm command or by entering
L#=value
as an argument to
fi where
#
is the
parameter number.
Replace
value
with
none to turn off
constraints.
Use
U#=value
or
U#=none
for the upper constraint.
- 12.6.1. - Description of the fit output