Re: [R] How to repeat a procedure

[Peter Wolf]

Haiyan Chen wrote:

Hello,

1. After I generate a 100x50 matrix by x3<-matrix(0,100,50);for (i in
1:100) {x1<-rpois(50, mu[i]);x2<-x1; x2[runif(50)<.01]<-0; x3[i,]<-x2},
2. I want to calculate means and sample variances of each row and create a
new matrix 100x2;
Try:

mean.var<-function(n=10, m=5){
mu<-(1:n)^2
x<-matrix(rpois(n*m,mu),n,m)
stat<-t(apply(x,1,function(x)c(mean(x),var(x))))
}
to set some elements of x to zero you can add an additional line in mean.var

3. I then want to repeat above procedure 500 times so that eventually I
will have 500 100x2 matrices.
n<-100; m<-50
n.comp<-500
for(i in 1:n.comp) 
eval(parse(text=paste("result",i,"<-mean.var(n,m)",sep="")))

Peter

Would someone mind helping me to code 2 & 3?

Thanks ahead of time.

Heyen

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