Next: ACCUMULATE /RESAMPLE
Up: LAS Language Internal Help
LAS\ACCUMULATE [/RESAMPLE [NX Xref Xval Xinc Unit]] [/NOCHECK
ACCUMULATE /2010 uses the old (obsolescent) averaging engine (as of year
2010). No options are allowed in this mode.
ACCUMULATE is used to add a pair of spectra together. The T spectrum is
added to the R spectrum using the current weighting function (see SET
WEIGHT). On return R contains the sum spectrum, and T the observation
previously in R. To add more than 2 spectra, you should build an index
and AVERAGE it in a single step instead (this will prevent cumulative
resamplings, respect the respective weights, and preserve at best the
The spectra are added channel by channel by default, if possible. Else
the option /RESAMPLE must be invoked (see subtopic for details).
ACCUMULATE checks the consistency between R and T, in particular the po-
sitional coincidence and calibration homogeneity according to SET
[NO]MATCH and SET CALIBRATION respectively. The option /NOCHECK allows
to disable some (using one or several names) or all (no name given) of
For EQUAL weights, ACCUMULATE computes the sum of the two spectra, al-
lowing addition of an ensemble of spectra after division by the total
number of spectra. For other weightings, ACCUMULATE computes the average
of the two spectra.
ACCUMULATE also works on Continuum drift. The alignement may be Channel
or Position in this case.