R | R Documentation |
Returns the rank of a matrix X
, using the QR decomposition, QR
.
Included here as a simple function, because rank
does something different
and it is not obvious what to use for matrix rank.
R(X)
X |
a matrix |
rank of X
qr
M <- outer(1:3, 3:1) M R(M) M <- matrix(1:9, 3, 3) M R(M) # why rank=2? echelon(M) set.seed(1234) M <- matrix(sample(1:9), 3, 3) M R(M)
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