事前に、書式設定が不十分で本当に申し訳ありません。私はそれのこつを得ることができないようです... 私はR初心者でもあります。
したがって、80 個の個々の魚の動きに関する情報を含む 80 個のファイルがあります。
> head(PAVdata)
X meanlat meanlong meandepth mindepth maxdepth depthrange rec numhits datetime mon X.1 Y Z
1 23 58.39601 8.708952 6.493529 5.72 7.47 1.75 4 17 2012-05-11 11:15:00 1 482986.7 6472838 6.493529
2 24 58.39618 8.710993 4.035588 1.76 7.47 5.71 6 34 2012-05-11 11:45:00 1 483106.1 6472855 4.035588
3 25 58.39615 8.710919 6.037692 3.08 8.35 5.27 6 26 2012-05-11 12:15:00 1 483101.8 6472853 6.037692
4 26 58.39556 8.710654 3.987500 2.20 6.16 3.96 5 16 2012-05-11 12:45:00 1 483086.0 6472787 3.987500
5 27 58.39617 8.711363 2.944615 2.20 3.96 1.76 6 26 2012-05-11 13:15:00 1 483127.8 6472855 2.944615
6 28 58.39628 8.710904 2.860000 2.20 3.52 1.32 6 24 2012-05-11 13:45:00 1 483101.0 6472867 2.860000
しかし、関心のある列はdatetimeとZで、Z は深さです。
私が目指しているのは;
- 深さの毎日および毎月の平均を取得する
- 毎日および毎月の最小値と最大値を取得します (振幅を見てください)
これまでに試したことは次のとおりです。
june<-c(PAVdata$datetime[grep("^2012-07",as.character(PAVdata$datetime))])
それは私にとって完全に大げさなものをもたらします
頭(6月) [1] 2390 2391 2392 2393 2394 2395
私はサブセットと集約とPOSIXltとタップリーとズーについて読んでいて、これらを試してみたかったのですが、長さの違いがあるというエラーが発生したようです..
POSIXlt を使用した試みを次に示します。
PAVdata$datetime <- strftime(as.POSIXlt(PAVdata$datetime,format="%Y-%m-%d %H:%M:%S"),format='%b')
june_Monthly_Avg <- ave(PAVdata$Z,PAVdata$datetime,FUN=平均)
head(june_Monthly_Avg) [1] 9.341862 9.341862 9.341862 9.341862 9.341862 9.341862
そして、すべてが同じ数字で構成されていました... 私はコマンドーを非常に間違って使用していると思います。
しかし、私はもっと簡単なことを試しました。
juni_Monthly_Avg <- ave(PAVdata$Z,PAVdata$datetime,FUN=平均)
head(juni_Monthly_Avg)
[1] 6.493529 4.035588 6.037692 3.987500 2.944615 2.860000
6 月には 1 つの値しか得られないので、混乱します。これまでのところ、 grepが最も有望に見えると思いますが、頭を悩ませているようには見えません。R Book とインターウェブ、そしてもちろん SO を数日間探し回っていたので、髪の毛をすべて抜く前に (そして上司に相談する前に) 助けを求めることにしました。
ありがとうございます^_^
> dput(head(PAVdata))
structure(list(X = 23:28, meanlat = c(58.3960117647059, 58.3961761764706,
58.3961507692308, 58.395558125, 58.3961726923077, 58.3962804166667
), meanlong = c(8.70895176470588, 8.71099294117647, 8.71091923076923,
8.71065375, 8.71136346153846, 8.71090416666667), meandepth = c(6.49352941176471,
4.03558823529412, 6.03769230769231, 3.9875, 2.94461538461538,
2.86), mindepth = c(5.72, 1.76, 3.08, 2.2, 2.2, 2.2), maxdepth = c(7.47,
7.47, 8.35, 6.16, 3.96, 3.52), depthrange = c(1.75, 5.71, 5.27,
3.96, 1.76, 1.32), rec = c(4L, 6L, 6L, 5L, 6L, 6L), numhits = c(17L,
34L, 26L, 16L, 26L, 24L), datetime = structure(1:6, .Label = c("2012-06-01 00:15:00", "2012-06-01 00:45:00",
"2012-06-01 01:15:00", "2012-06-01 01:45:00", "2012-06-01 02:15:00",
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