On Mar 14, 2010, at 8:11 AM, Dimitris Kapetanakis wrote:
Dear all,
I would like to create a number of vectors which contain the the
first n
elements of an existing vector.
For example I have the vectors vnk (200x1) and vro(200x1) and I want
to
create 200 vectors that contain the 1st till the n_th element of the
vectors
and thus be able to create a vector s with 200 elements which are the
product of all these vectors:
i.e s1<-vnk[1]%*%vro[1] +p^(length(vp[1]+1))
s2<-vnk[1:2]%*%vro[1:2]+p^(length(vp[1:2]+1))
s3<-vnk[1:3]%*%vro[1:3]+p^(length(vp[1:3]+1))
...............................
...............................
s200<-vnk[1:200]%*%vro[1:200]+p^(length(vp[1:200]+1))
s<-[s1 s2 ......s200]
In the code I created I can calculate only the 200th element
vnk<-t(nk^(200:0))
vro<-ro^(0:200)
s<-nz*e*(vnk%*%vp)+p^(length(vp))
Here is a guess, untested because you provided no sample data objects:
s <- sapply(1:200, function (x) { vnk[1:x]%*%vro[1:x] +
p^(length(vp[1:x]+1)) } )
if lapply wouldn't need functions but vector arguments it would do
the job
perfectly but I don't know the respective command for vectors. If
you know
please tell me.
Any help would be highly appreciated
Thanks a lot
Dimitris
David Winsemius, MD
West Hartford, CT
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