Function to set by reference the "multiple.wl" attribute of an existing generic_spct or an object of a class derived from generic_spct.
a generic_spct object
numeric >= 1 If
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. If
Other multiple.wl attribute functions:
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