[R] how to convert the lower triangle of a matrix to a symmetricmatrix

[marella]

@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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