On Tue, Apr 09, 2002 at 07:12:08PM +0200, Peter Dalgaard BSA wrote:

Laurent Gautier <laurent@genome.cbs.dtu.dk> writes:

Z <- x * y

seems to do the job....Nope. Try it with x <- matrix(1,10,5) and see.

Laurent Gautier <laurent@genome.cbs.dtu.dk> writes:

On Tue, Apr 09, 2002 at 05:46:40AM -0700, sonchawan tamkaew wrote:

Dear all,

My questions are that if I have

loop?

Dear all,

My questions are that if I have

x<-rnorm(50)

dim(x)<-c(10,5)

y=1:5

Z<-matrix(0,NROW(x),NROW(y))

for (j in 1:NROW(y)) Z[,j]<-x[,j]*y[j]

1. Is there any other way to write this without 'for'dim(x)<-c(10,5)

y=1:5

Z<-matrix(0,NROW(x),NROW(y))

for (j in 1:NROW(y)) Z[,j]<-x[,j]*y[j]

loop?

Z <- x * y

seems to do the job....

...right... it was 'y[j]' and not 'y[,j]' (blurry eyes... looking too long at the screen)

this is probably what everybody already gave:

(I receive r-help few hours before the first ones to receive it)

x * matrix(y, ncol=ncol(x), nrow=nrow(x), byrow=T)

(I hope it work for good now... :) )

L.

--

O__ ---- Peter Dalgaard Blegdamsvej 3

c/ /'_ --- Dept. of Biostatistics 2200 Cph. N

(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918

~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-O__ ---- Peter Dalgaard Blegdamsvej 3

c/ /'_ --- Dept. of Biostatistics 2200 Cph. N

(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918

~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907

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