Estefania, if you do something like
your.matrix <- matrix(1, 50, 50)
your.matrix[upper.tri(your.matrix)] <- NA
You will have NAs for the entire upper triangle. If you opt to do
your.matrix[upper.tri(your.matrix)] <- ""
The upper triangle will be empty but it will coerce data to be 'character'
instead of 'numeric'. Hope it helps.
-----Mensagem original-----
De: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Em nome
de Estefania Ruiz Vargas
Enviada em: sexta-feira, 13 de maio de 2011 11:53
Para: r-help@r-project.org
Assunto: [R] How to store a triangular matrix
Hello, I want to create a triangular matrix and only keep the lower triangle
entries without having to allocate memory for the whole matrix, is there any
way I can do something like A<-matrix(data, nrow=50)
but for a triangular matrix?
Thanks
ERV
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