Get spectra from all the groups of the top tab/spec-tree. Only the checked ones or all of them. Variables are by columns; measurements are by rows. The reason is "prcomp" principal component analysis accepts that order of data. Excluding the spectra from a group called "unknowns". That protected name is supposed to be for testing purposes only, so the data from that group are not included in all-data-get command.
- logical; if true gets only the checked specs
spnGetTree returns the matrix of specs from all the groups.
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