Command FPOS
Parameters Defaults
FPOS peaks
/
GUESS(gg)
MIN(mn)
MAX(mx)
DIFF(pref)
QUOT(pref)
FIX
VARY
RELATIVE
NOLIM
LIST
EON
EOFF
Purpose
Defines values and attributes of peak positions.
Example
FPOS 3 / diff(4) g(80) r
fixes the difference of the positions of peaks number 3 and 4 (#3-#4) to 80.
Peak number 4 is the reference peak (not changed).
Position of peak number 3 is set to the position of peak number 4 + 80.
FPOS 3 / diff(4) g(80)
The position of peak number 3 is set to 80.
The difference of the positions of peaks number 3 and 4 (#3-#4) is fixed at the value
80 minus the position of peak number 4.
Parameter PEAKS
List of peak numbers. * means all peaks.
Parameter GUESS(gg)
List of guess values for peak positions.
If only a single value is given it is assigned to all specified peaks.
Parameter MIN(mn)
List of lower limits for peak positions.
Must not exceed the current values of peak positions.
Further conventions see command parameter GUESS().
Parameter MAX(mx)
List of upper limits for peak positions.
Must not be exceeded by the current values of peak positions.
Further conventions see command parameter GUESS().
Parameters DIFF(pref),QUOT(pref)
The specified peak positions are relatively fixed.
The differences or quotients, respectively,
of the specified peaks and the reference peak pref
are held constant during iterations.
Parameter FIX
The specified peak positions are held constant during iterations
Parameter VARY
The specified peak positions are allowed to vary during iterations
Parameter RELATIVE
For relatively fixed peak positions (DIFF() QUOT())
the guess values (GUESS()) are assumed
to be difference, sum or quotient with respect to the corresponding
reference peak parameters.
Parameter NOLIM
Limits of the specified positions are set to infinity
Parameter LIST
List the specified peak positions
Parameter EON
Enable asymmetric error analysis for peak positions.
This might be time consuming
Parameter EOFF
Disable asymmetric error analysis for peak positions.