isSymmetric(M) returns a
M is a symmetric matrix. This (now) is a base function
with a default method for the traditional matrices of
"matrix". Methods here are defined for virtual Matrix classes
such that it works for all objects inheriting from class
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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