R help - Apr 2007 - how to convert the lower triangle of a matrix to a symmetricmatrix

Sorry if this answer was already given, or if I miss the point,
but did you have a look to "lowerTriangle" and
"upperTriangle" functions
in the "gdata" package ?

# example
# A<-matrix(rnorm(9),3,3)
# B<-B<-matrix(NA,dim(A)[1],dim(A)[2])
# lowerTriangle(B)<-lowerTriangle(A)
# upperTriangle(B)<-lowerTriangle(A)
# diag(B)<-diag(A)

Hope this helps, sorry if it was already answered.
Olivier

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Olivier ETERRADOSSI
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@Olivier ETERRADOSSI : 

I tried "gdata" to convert a (10000x10000) lower triangular matrix to
full
matrix and got memory problems. Especially at this step :

upperTriangle(a) <- lowerTrangle(a)

it consumes more than 3 GB . Any ideas on how to create full matrix with
efficient memory management ?

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