t transpose an NMF model, by transposing and
swapping its basis and coefficient matrices:
t([W,H]) = [t(H), t(W)].
S3 (NMF)
`t`(x)
The function t is a generic defined in the
base package. The method t.NMF defines the
trasnformation for the general NMF interface. This method
may need to be overloaded for NMF models, whose structure
requires specific handling.
x <- rnmf(3, 100, 20)
x
## <Object of class:NMFstd>
## features: 100
## basis/rank: 3
## samples: 20
# transpose
y <- t(x)
y
## <Object of class:NMFstd>
## features: 20
## basis/rank: 3
## samples: 100
# factors are swapped-transposed
stopifnot( identical(basis(y), t(coef(x))) )
stopifnot( identical(coef(y), t(basis(x))) )