I want to construct a symmetric band matrix in the Matrix package from a matrix
where the first column contains data for the main diagonal, the second column
has data for the first subdiagonal/superdiagonal and so on.
Since the Matrix will be 10^5 x 10^5 or so, with perhaps 10-20 non-zero
elements above the diagonal per row, I can't do it by constructing a full
matrix and then using the band() function to subset it to a band matrix.
Any suggestions?
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
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