the following code: m<-matrix(nrow=10,ncol=10) i<-1001 mx<-trunc(i/1000) my<-(i/1000-mx)*1000 m[mx,my]<-1 does not assign the value at the matrix m[1,1] Any hints? Thanks v -- View this message in context: http://www.nabble.com/Matrix-set-value-problem-tp18253809p18253809.html Sent from the R help mailing list archive at Nabble.com.