I don't see why making copies of the columns you need inside the loop is
better memory management. If the data are in a matrix, accessing
elements is quite fast. If you're worrying about speed of that, do what
Charles suggest: work with the transpose so that you are accessing
elements in the
Liaw, Andy wrote:
I don't see why making copies of the columns you need inside the loop is
better memory management. If the data are in a matrix, accessing
elements is quite fast. If you're worrying about speed of that, do what
Charles suggest: work with the transpose so that you are
On Tue, 20 Feb 2007, Federico Calboli wrote:
Liaw, Andy wrote:
I don't see why making copies of the columns you need inside the loop is
better memory management. If the data are in a matrix, accessing
elements is quite fast. If you're worrying about speed of that, do what
Charles
Charles C. Berry wrote:
This is a bit different than your original post (where it appeared that
you were manipulating one row of a matrix at a time), but the issue is
the same.
As suggested in my earlier email this looks like a caching issue, and
this is not peculiar to R.
Viz.
