On 12 January 2008 at 16:18, Sandrine-et-Francois wrote:
| Dear R-list,
| I'm experiencing some problems while using "strptime", which I don't
understand.
|
| > str(natver)
| 'data.frame': 154 obs. of 8 variables:
| $ ID : Factor w/ 14 levels "AC","ALS","FA",..: 10 11 9 1 4 8 13 3 14 12
...
| $ CdBMin : int 22 22 26 26 28 23 27 23 25 26 ...
| $ CdBMax : int 22 24 27 26 32 26 29 30 29 28 ...
| $ Hrend : int 184 NA 120 168 NA 152 165 160 140 140 ...
| $ Age : int 28 32 44 21 35 47 36 29 36 43 ...
| $ Weight : int 63 70 80 57 69 74 82 71 85 70 ...
| $ variable: Factor w/ 11 levels "X50","X100","X150",..: 1 1 1 1 1 1 1 1 1 1
...
| $ value : Factor w/ 47 levels "00:00:36","00:00:39",..: 1 2 4 3 3 4 5 7 8
6 ...
| >
| > head(natver)
| ID CdBMin CdBMax Hrend Age Weight variable value
| 1 PHu 22 22 184 28 63 X50 00:00:36
| 2 PK 22 24 NA 32 70 X50 00:00:39
| 3 PH 26 27 120 44 80 X50 00:00:46
| 4 AC 26 26 168 21 57 X50 00:00:42
| 5 FT 28 32 NA 35 69 X50 00:00:42
| 6 OA 23 26 152 47 74 X50 00:00:46
| >
| > natver$Time<-strptime(natver$value, format="%d/%m/%Y %H:%M:%S")
|
| Erreur dans `$<-.data.frame`(`*tmp*`, "Time", value = list(sec = c(NA_real_,
:
| le tableau de remplacement a 9 lignes, le tableau remplac? en a 154
It's a FAQ. Try
natver$Time <- as.POSIXct(strptime(natver$value, format="%d/%m/%Y
%H:%M:%S"))
to cast the nine-element list of POSIXlt results generated by strptime into a
single figure POSIXct.
Amicalement, Dirk
--
Three out of two people have difficulties with fractions.
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