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2007 Jul 20
1
Column-mean-values for targeted rows
...es with 1)
As a very fresh "programmer" I have build a simple function in R which should not be very efficient indeed! It works well for current-dimension matrices, but it just not goes so well in huge ones.
meanprob<-function(Robj){
NLINE<-dim(Robj)[1];
NCOLUMN<-dim(Robj)[2];
mprob<-c(rep(0,(NCOLUMN-1)));
for (i in 2:NCOLUMN){
sumprob<-0;
pa<-0;
for (j in 1:NLINE){
if(Robj[j,1]!=0){
pa<-pa+1;
sumprob<-Robj[j,i]+sumprob;
}
}
mprob[i-1]<-sumprob/pa;
}
return(mprob);
}
So I &qu...