Re: [R] How to quickly find the position of the first non-zero element of a vector

Fast fingers. Had to change the test: > vlarge <- c(numeric(20),1:20) > system.time( + for (i in 1:3) { +which.min(!(vlarge != 0))}) # test changed user system elapsed 0.350.000.42 > > #Method 2: > system.time( + for (i in 1:3) { + for (i in 1:40) { + if (vlarge[

Re: [R] How to quickly find the position of the first non-zero element of a vector

try .which.mine Here is what is does on my system: > vlarge <- c(numeric(20),1:20) > system.time( + for (i in 1:3) { +which.min(vlarge != 0)}) user system elapsed 0.300.000.35 > > #Method 2: > system.time( + for (i in 1:3) { + for (i in 1:40) { + if (vlarge[i] != 0