lower.tri | R Documentation |
Returns the lower or upper triangular structure or entries of a sparse matrix.
lower.tri(x, diag = FALSE)
upper.tri(x, diag = FALSE)
x |
a sparse matrix of class |
diag |
logical. Should the diagonal be included? |
Often not only the structure of the matrix is required but the
entries as well. For compatibility, the default is only a structure
consisting of ones (representing TRUE
s). Setting the flag
getOption( "spam.trivalues")
to TRUE
,
the function returns the actual
values.
spam.options
and diag
smat <- spam( c( 1,2,0,3,0,0,0,4,5),3)
upper.tri( smat)
upper.tri( smat, diag=TRUE)
options(spam.trivalues=TRUE)
upper.tri( smat)
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