] FALSE> AirQuality[4,1][1] 1868 Levels: 1 > 10 108 11
110 115 118 12 122 13 135 ... NA>
John Kane
Kingston ON Canada
> -Original Message-
> From: sar...@greenhorizon.in
> Sent: Mon, 13 Apr 2015 06:33:19 -0700
> To: r-help@r-project.org
> Subject: [
This is almost unreadable due to HTML posting (do read the posting guide!).
However, it would seem that you somehow got your data converted to factors of
which one level is NA.
This may be surprising, but the difference is like that of
> factor(c("NA", 18))
[1] NA 18
Levels: 18 NA
> factor(c("
My AirQuality[4,1] is equal to 18 and AirQuality[5,1] is equal to NA.
When I type the following
> is.na(AirQuality[5,1])[1] FALSE> AirQuality[5,1][1] NA68 Levels: 1 10 108 11
> 110 115 118 12 122 13 135 ... NA> is.na(AirQuality[4,1])[1] FALSE>
> AirQuality[4,1][1] 1868 Levels: 1 10 108 11 110 115
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