Dear R community,
I am using a dataframe with lots of NAs and wish to create subsets from
that dataframe. In the example below I intend to create a subset with all
entries with V1>1. To my surprise the result also contains all entries with
V1=NA. I would wish to learn more why this is or what I do wrong. I know
that I can use the command "subset" and the NAs will not appear, but what is
"wrong" with a[a$V1>1,]?
Thank you!
Georg.
*******************
Georg Ehret
Johns Hopkins
Baltimore, USA
> a
V1 V2 V3 V4 V5
1 NA NA NA -2056.5981 0.8472496
2 NA NA NA 1407.8786 1.3349255
3 NA NA NA 579.2203 0.6082337
4 NA NA NA 1337.0740 1.0346453
5 NA NA -3.732253 -246.7270 1.9218894
6 NA -4.111501 -50.372053 -1512.2618 -0.8425137
7 100.0000000 -2.343761 -132.606282 101.7575 1.1870040
8 -1.8899018 11.921323 15.988519 -1199.5994 0.1907434
9 0.4819706 5.677561 29.677330 -200.9182 -0.1213408
10 -1.4981107 6.224487 209.133480 188.8852 -1.3321220
> b<-a[a$V1>1,]
> b
V1 V2 V3 V4 V5
NA NA NA NA NA NA
NA.1 NA NA NA NA NA
NA.2 NA NA NA NA NA
NA.3 NA NA NA NA NA
NA.4 NA NA NA NA NA
NA.5 NA NA NA NA NA
7 100 -2.343761 -132.6063 101.7575 1.187004
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