It's not corect. Vector with length 15*10^6 you could store in memory without ff packages. For vector 15*10^7
k=bit(15*10^7) a=ff(2,15*10^7) system.time(k<-a[,chunk(1,length.ff(a),1e4)]<1) Error: cannot allocate vector of size 572.2 Mb In addition: Warning messages: 1: In system.time(k <- a[, chunk(1, length.ff(a), 10000)] < 1) : Reached total allocation of 1535Mb: see help(memory.size) 2: In system.time(k <- a[, chunk(1, length.ff(a), 10000)] < 1) : Reached total allocation of 1535Mb: see help(memory.size) 3: In system.time(k <- a[, chunk(1, length.ff(a), 10000)] < 1) : Reached total allocation of 1535Mb: see help(memory.size) 4: In system.time(k <- a[, chunk(1, length.ff(a), 10000)] < 1) : Reached total allocation of 1535Mb: see help(memory.size) Timing stopped at: 2.13 0.84 10.45 And you don't understand my question. In simple operation in R I could do: a=c(1,4,5,6) b=a[a>1] b [1] 4 5 6 If a is ff object (for example length=15*10^7) this operation doesn't work. Mayby I don't understand something or this operation is not definied currently in this package. In summarizing: I have very long vector stored in ff object and I want to chse elements from this vector which fulfil logical expresion (for example a>1). -- View this message in context: http://r.789695.n4.nabble.com/Use-logical-expresion-on-ff-object-tp3752127p3754673.html Sent from the R devel mailing list archive at Nabble.com. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
