Re: [R] Construct a lower-triangular matrix

>> >> I'm also not buying the sqrt(length(a))+1 bit --- floor(2*length(a)) is more >> like it. >> > > Shouldn’t that be > > m <- sqrt(floor(2*length(a))) > M <- matrix(0,m,m) > > for the general case? > > Berend > Closer, but I actually meant: floor(sqrt(2*length(a))) if k is m*(m+1)/2,

Re: [R] Construct a lower-triangular matrix

> On 10 Oct 2015, at 13:39, peter dalgaard wrote: > >> >> On 10 Oct 2015, at 10:49 , Berend Hasselman wrote: >> >>> >>> On 10 Oct 2015, at 10:00, David Winsemius wrote: >>> >>> >>> On Oct 9, 2015, at 10:57 PM, Steven Yen wrote: >>> Dear How do you construct a lower triangular m

Re: [R] Construct a lower-triangular matrix

> On 10 Oct 2015, at 10:49 , Berend Hasselman wrote: > >> >> On 10 Oct 2015, at 10:00, David Winsemius wrote: >> >> >> On Oct 9, 2015, at 10:57 PM, Steven Yen wrote: >> >>> Dear >>> How do you construct a lower triangular matrix from a vector. >>> >>> I want to make vector >>> >>> a <- 1:

Re: [R] Construct a lower-triangular matrix

> On 10 Oct 2015, at 10:00, David Winsemius wrote: > > > On Oct 9, 2015, at 10:57 PM, Steven Yen wrote: > >> Dear >> How do you construct a lower triangular matrix from a vector. >> >> I want to make vector >> >> a <- 1:10 >> >> into a triangular matrix >> >> 1 0 0 0 >> 2 3 0 0 >> 4 5 6

Re: [R] Construct a lower-triangular matrix

On Oct 9, 2015, at 10:57 PM, Steven Yen wrote: > Dear > How do you construct a lower triangular matrix from a vector. > > I want to make vector > > a <- 1:10 > > into a triangular matrix > > 1 0 0 0 > 2 3 0 0 > 4 5 6 0 > 7 8 9 10 > I'm not sure this method with logical indexing will be t

[R] Construct a lower-triangular matrix

Dear How do you construct a lower triangular matrix from a vector. I want to make vector a <- 1:10 into a triangular matrix 1 0 0 0 2 3 0 0 4 5 6 0 7 8 9 10 Thank you! [[alternative HTML version deleted]] __ R-help@r-project.org mailing