Hi Christoph,
I'm not sure I understand your conditions. It is an "AND" or an "OR",
i.e. must both conditions be met to subset or any one of them?
From your explanation, I would think you really mean AND, but then I
don't understand why you would select both lines 3 and 4.
I would just say:
df[df$N <= 0.3, ]
but I might be missing something.
You should also be careful with floating point numbers, I guess.
HTH,
Ivan
--
Ivan Calandra
University of Franche-Comté
Laboratoire Chrono-Environnement
Bureau ATER -107L
16, Route de Gray
25030 Besançon Cedex, France
ivan.calan...@univ-fcomte.fr
+33 (0) 381 66 20 60
http://chrono-environnement.univ-fcomte.fr/spip.php?article1830
Le 28/04/14 10:37, Christoph Schlächter a écrit :
Hello,
I want to subset a data.frame containing the variables "Date" in (%Y %m %d
) and "N".
I want to print "Date" and "N" if N is less than or equal to 0.3 and if
"N" is also less than or equal to 0.3 on the day before the day where "N"
is less than or equal to 0.3.
This would be the case in line 3 and 4 , 6 and 7, 12 to 18, and so on.
"Date" "N"
"1" 2010-01-01 0
"2" 2010-01-02 1.9
"3" 2010-01-03 0
"4" 2010-01-04 0
"5" 2010-01-05 1.6
"6" 2010-01-06 0
"7" 2010-01-07 0.3
"8" 2010-01-08 0
"9" 2010-01-09 1.1
"10" 2010-01-10 1.7
"11" 2010-01-11 2.6
"12" 2010-01-12 0
"13" 2010-01-13 0
"14" 2010-01-14 0
"15" 2010-01-15 0
"16" 2010-01-16 0
"17" 2010-01-17 0
"18" 2010-01-18 0.2
"19" 2010-01-19 0
"20" 2010-01-20 0
"21" 2010-01-21 0
"22" 2010-01-22 0
"23" 2010-01-23 0
"24" 2010-01-24 0
"25" 2010-01-25 0
"26" 2010-01-26 0
"27" 2010-01-27 1.9
"28" 2010-01-28 6.2
"29" 2010-01-29 0
"30" 2010-01-30 0
I tried some methods with subset but I couldn't work it out. Maybe I have
to use something like " for (i in x) {} but as a beginner I really don't
know how to do it.
Can somebody please help me with this.
Thanks in advance,
Christoph
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