How to repeat a procedure
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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