Displaying 2 results from an estimated 2 matches for "sumprob".
2007 Jul 20
1
Column-mean-values for targeted rows
...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 "only" see 3 ways to get through the problem:
- to reform...
2011 Oct 02
2
Sum of Probabilities in a matrix...
Hi all,
I have 2 columns in a mtrix, one of which is a column of probabilities and
the other is simply a vector of integers. I want to sum all the
probabilities with the same integer value and put it in a new column.
For example,
If my matrix is:
0.98 2
0.2 1
0.01 2
0.5 1
0.6 6
Then I should get:
0.98 2 0.99
0.2 1 0.70
0.01 2 0.99
0.5 1 0.70
0.6 6