object, or the objective value with respect to a given target matrix
yif it is supplied.
Returns the objective function associated with the
algorithm that computed the fitted NMF model
object, or the objective value with respect to a
given target matrix
y if it is supplied.
## S4 method for signature 'NMFfit' objective(object, y)
optional target matrix used to compute the objective value.
an object computed using some algorithm, or that describes an algorithm itself.
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