isSymmetric(M)
returns a logical
indicating
if M
is a symmetric matrix. This (now) is a base function
with a default method for the traditional matrices of class
"matrix"
. Methods here are defined for virtual Matrix classes
such that it works for all objects inheriting from class
Matrix
.
forceSymmetric
, symmpart
, and the
formal class (and subclasses) "symmetricMatrix"
.
1 2 3 4 5 6 7 8 | isSymmetric(Diagonal(4)) # TRUE of course
M <- Matrix(c(1,2,2,1), 2,2)
isSymmetric(M) # TRUE (*and* of formal class "dsyMatrix")
isSymmetric(as(M, "dgeMatrix")) # still symmetric, even if not "formally"
isSymmetric(triu(M)) # FALSE
## Look at implementations:
showMethods("isSymmetric", includeDefs=TRUE)# "ANY": base's S3 generic; 6 more
|
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