Function to set by reference the "idfactor" attribute of an existing generic_spct or an object of a class derived from generic_spct.
a generic_spct object
character The name of a factor identifying multiple spectra stored longitudinally.
This function alters x itself by reference and in addition returns x invisibly. If x is not a generic_spct or an object of a class derived from generic_spct, x is not modified.
Other idfactor attribute functions:
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