Force a square matrix
x to a
without a symmetry check as it would be applied for
any square matrix (of numbers), either “"traditional"”
a square matrix inheriting from class
symmpart for the symmetric part of a matrix, or
as(x, <symmetricMatrix class>).
## Hilbert matrix i <- 1:6 h6 <- 1/outer(i - 1L, i, "+") sd <- sqrt(diag(h6)) hh <- t(h6/sd)/sd # theoretically symmetric isSymmetric(hh, tol=0) # FALSE; hence try( as(hh, "symmetricMatrix") ) # fails, but this works fine: H6 <- forceSymmetric(hh) ## result can be pretty surprising: (M <- Matrix(1:36, 6)) forceSymmetric(M) # symmetric, hence very different in lower triangle (tm <- tril(M)) forceSymmetric(tm)
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