Generally unambiguous questions get answered quickly. Perhaps other
readers are having the same difficulties I am experiencing. So let's
try to parse what you are asking:
On Apr 2, 2009, at 8:26 AM, Kutlwano Ramaboa wrote:
Hello
This may have been answered elsewhere, and I have looked on the web,
but nothing helps. I am trying to do the following:
X<-matrix(c(1:15),nrow=3,byrow=T)
Y<-matrix(c(2,4,6,8,10),ncol=1)
I need to sum the product of each row of X
"sum the product of each row" ==? sum( prod(x[i, ] * ?
by the remaining j rows
"remaining j rows" ==? What is "j", Is it nrow(X)-1 ? An what sort of
"multiplication by rows" do you mean? The inner product?
multiplied by j y values (i.e sum( t(x_i) x_j y_j) )
"multiplied by j y values" ==? You defined Y but not y. Assuming that
you meant Y values, then we are still left to speculate about which of
the 5 Y values are suppose to be matched to the 3 rows of X.
Hope this makes sense.
Not to me.
Thanks in advance.
Ps: how do I reference all the help that I have had from the R: team?
?citation
[[alternative HTML version deleted]]
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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