Revision ce60f670aac0a708d3a9af5f0cf46a752d46ba8a authored by John M Chambers on 28 October 2020, 07:59:48 UTC, committed by cran-robot on 28 October 2020, 07:59:48 UTC
1 parent 698183c
triDiag2.R
triDiag2 <- function(diagonal, upper, lower,
nrow = length(diagonal), ncol = nrow) {
value <- diag(diagonal, nrow = nrow, ncol = ncol)
n <- min(nrow, ncol-1)
if(n>0) {
rseq <- 1:n
value[cbind(rseq, rseq+1)] <- upper
}
n <- min(nrow-1, ncol)
if(n > 0) {
rseq <- 1:n
value[cbind(rseq+1, rseq)] <- lower
}
value
}
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