Re: [R] Matrix set value problem

Hi, when you do the trunc the mx is not a real integer 1 so you must round up m<-matrix(data=NA, nrow=10,ncol=10) i<-1001 mx<-round(trunc(i/1000)) my<-round((i/1000-mx)*1000) m[mx,my]<-1 m [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,]1 NA NA NA NA NA NA NA N

Re: [R] Matrix set value problem

This is similar to FAQ 7.31. my is *printed* as 1, but in fact it is slightly smaller. Try print(my, digits = 15). Rounding my works. m<-matrix(nrow=10,ncol=10) i<-1001 mx<-trunc(i/1000) my<-round((i/1000-mx)*1000, 0) m[mx, my]<-1 Thierry ---