如何获取特定名称的行索引号? [英] How to get row index number for particular name(s)?

问题描述

如何确定特定行名称对应的行索引号?我有一个行名称向量，我想使用它们来获取矩阵中相应行索引的向量.

How can one determine the row index-numbers corresponding to particular row names? I have a vector of row names, and I would like to use these to obtain a vector of the corresponding row indices in a matrix.

我尝试了 row() 和 as.integer(rownames(matrix.object))，但似乎都不起作用.

I tried row() and as.integer(rownames(matrix.object)), but neither seems to work.

推荐答案

除了which，还可以看match:

m <- matrix(1:25, ncol = 5, dimnames = list(letters[1:5], LETTERS[1:5]))
vec <- c("e", "a", "c")
match(vec, rownames(m))
# [1] 5 1 3

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