Get spectra from one spec-group (matrix). All the spectra in a group are assumed to have common X set of values, so if there is loaded spectrum in different X values, the spectrum is recalculated to fit that reference set.
- logical; if true gets only the checked specs.
- the name(character string) or the index(integer) of the group; 0 - active group.
spnGetGrp returns a preprocessed group data in matrix. Spectra are always in rows (one spectrum is one row). The variables are columns, one variable (e.g. mass) is one column.
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