在R中为数据帧选择多个奇数或偶数列/行 [英] Selecting multiple odd or even columns/rows for dataframe in R
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问题描述
我正在绘制我的主成分分析的加载项。我有84行数据这样订购: x_1
y_1
x_2
..... x_42
y_42
目前,我正在为x和y加载数据创建数据,如下所示:
data.pc = princomp .matrix(data))
x.loadings< - data.frame(x = data.pc $ loadeds [c(1,3,5,7,9,11,13,15, 17,19,
21,23,25,27,29,31,33,35,37,39,41),1])$ b
$ b yloadings< - data.frame( y = data.pc $ loadings [c(2,4,6,8,10,12,14,16,18,20,
22,24,26,28,30,32,34,36, 38,40,42),1])$ b $ b
当然有一个更简单的方法来做到这一点?
解决方案
您可以随时使用seq生成序列:
even_indexes< -seq(2,42,2)
odd_indexes< -seq(1,41,2)
然后,
x.loadings< - data.frame(x = data.pc $ loadings [odd_indexes,1])$ b $ b
Is there a way in R to select many non-consecutive i.e. odd or even rows/columns?
I'm plotting the loadings for my Principal Components Analysis. I have 84 rows of data ordered like this: x_1
y_1
x_2
..... x_42
y_42
And at the moment I am creating the dataframes for the x and y loadings figures like this:
data.pc = princomp(as.matrix(data))
x.loadings <- data.frame(x=data.pc$loadings[c(1, 3, 5, 7, 9, 11, 13 ,15, 17, 19,
21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41), 1])
yloadings <- data.frame(y=data.pc$loadings[c(2, 4, 6, 8, 10, 12, 14, 16, 18, 20,
22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42), 1])
Surely there's an easier way to do this?
解决方案
You can always generate sequences with seq:
even_indexes<-seq(2,42,2)
odd_indexes<-seq(1,41,2)
Then,
x.loadings <- data.frame(x=data.pc$loadings[odd_indexes,1])
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