[R] NA, deleting rows

2003-12-18 Thread juli g. pausas
Dear colleges, I do not understand the following behaviour: aa - data.frame(a1= 1:10, a2= c(rep(NA, 5), 1:5) ) aa a1 a2 1 1 NA 2 2 NA 3 3 NA 4 4 NA 5 5 NA 6 6 1 7 7 2 8 8 3 9 9 4 10 10 5 aa[!aa$a2==1, ] # removing rows with a2==1 a1 a2 NA NA NA NA.1 NA NA NA.2 NA NA

Re: [R] NA, deleting rows

2003-12-18 Thread Sundar Dorai-Raj
Take a look at what (aa$a2 == 1) returns and it may clear things up. Try aa[-which(aa$a2 == 1), ] or subset(aa, a2 != 1 | is.na(a2)) HTH, Sundar juli g. pausas wrote: Dear colleges, I do not understand the following behaviour: aa - data.frame(a1= 1:10, a2= c(rep(NA, 5), 1:5) ) aa a1 a2 1

Re: [R] NA, deleting rows

2003-12-18 Thread Achim Zeileis
On Thu, 18 Dec 2003 15:03:04 +0100 juli g. pausas wrote: Dear colleges, I do not understand the following behaviour: aa - data.frame(a1= 1:10, a2= c(rep(NA, 5), 1:5) ) aa a1 a2 1 1 NA 2 2 NA 3 3 NA 4 4 NA 5 5 NA 6 6 1 7 7 2 8 8 3 9 9 4 10 10 5

Re: [R] NA, deleting rows

2003-12-18 Thread Thomas Lumley
On Thu, 18 Dec 2003, juli g. pausas wrote: Dear colleges, I do not understand the following behaviour: aa - data.frame(a1= 1:10, a2= c(rep(NA, 5), 1:5) ) aa[!aa$a2==1, ] # removing rows with a2==1 a1 a2 NA NA NA NA.1 NA NA NA.2 NA NA NA.3 NA NA NA.4 NA NA 7 7 2 8