On Aug 8, 2011, at 12:18 AM, Lei Liu wrote:
Hi there,
I have two questions on matrix manipulation. For the first one, I
want to calculate the product of each column of a matrix (say A)
with another vector (say b). That is, if A has 5 columns (a1, a2,
a3, a4, a5), I want to obtain a matri
Hi Lei,
Here are some examples. Look at the documentation for ?"%*%" ?"%o%"
and ?"[" with the drop = FALSE argument (in case you ever do select
just one column/row of a matrix).
## your first A matrix
(A <- matrix(1:55, ncol = 5))
## you were rather unclear what
## your b vectors dimensions wer
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