R:有效地从数组中删除单例尺寸 [英] R: Efficiently remove singleton dimensions from array

问题描述

我正在寻找一种从R中的数组中删除冗余维的快速方法，类似于MATLAB中的squeeze()命令. 现在，我结合了reshape2软件包中的melt()和cast()命令，但是应该有一种不太复杂的方法.

I am looking for a fast way to remove redundant dimensions from an array in R, similar to the squeeze() command in MATLAB. Right now I combine the melt() and the cast() commands from the reshape2 package, but there should be a less intricate way of doing the same.

到目前为止，这是我的操作方式:

This is how I do it so far:

    require(reshape2)
    array3d <- array(rep(0,4),dim=c(1,2,2)) # create a 2*2 matrix within a 3-d array
    acast(melt(array3d),Var2~Var3) # recover the matrix

推荐答案

听起来您正在寻找drop()，它删除仅具有一个级别的数组的维数".

It sounds like you're looking for drop(), which "delete[s] the dimensions of an array which have only one level".

drop(array3d)
#       [,1] [,2]
# [1,]    0    0
# [2,]    0    0

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