R help - Nov 2006 - simulation with "rpois"

Hi there, I need some helpo with one simulation.
I have a matrix of 4x21
I want ro generate 100 random Chi2 distribution but inly from the first 
row of my matrix.
This is what I try:
Option (a):
 >lambda=1:100
 >f=function(x)chisq(4,0,x)
 >lapply(lambda,f)
It doesn't work!

option(b):
 >m=mean(matrix[1,])
 >x<-rpois(100,lambda=m)
Works, but only generates a row of 25 values.
The point is:
I need a matrix of 100(rows) x 4(columns)

thanks a lot!

I think there's only one mistake in your instructions. Try this:
 >lambda=1:100
 >f=function(x)rchisq(4,0,x)
 >lapply(lambda,f)
It generates a list of 4-length vectors.
Notice that the function 'chisq' doesn't exists. I suppose it has to
be
replaced by 'rchisq'.


Isaac.
 

-----Mensaje original-----
De: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] En nombre de Pablo Andres
Enviado el: jueves, 02 de noviembre de 2006 12:59
Para: R-help at stat.math.ethz.ch
Asunto: [R] simulation with "rpois"

Hi there, I need some helpo with one simulation.
I have a matrix of 4x21
I want ro generate 100 random Chi2 distribution but inly from the first
row of my matrix.
This is what I try:
Option (a):
 >lambda=1:100
 >f=function(x)chisq(4,0,x)
 >lapply(lambda,f)
It doesn't work!

option(b):
 >m=mean(matrix[1,])
 >x<-rpois(100,lambda=m)
Works, but only generates a row of 25 values.
The point is:
I need a matrix of 100(rows) x 4(columns)

thanks a lot!

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--

Hi there!
I need a piece of advice obtaining the average of 4 samples from 
different sample sizes.
lets's see that my numbers are:

6,3,6 and 15
and each one comes from:
100,130,125 and 33 sample sizes.

I need a command in R to solve this!
I guess it should not be complicated but... it happens to me! jejeje
Thanks a Lot

Pablo