在r中找到具有最低值的列

问题描述

我有一个大尺寸的矩阵，并尝试查找每行具有最小值的列.例如，这是我的矩阵(只需使用matrix(sample(12),nrow = 3)生成).对于矩阵，我希望有一个向量(3,4,1)来表示列号，该列号包含每行中的最小值.我该怎么办?该问题可以重复，但我找不到答案.

I have large size matrix and try to find the column that has the minimum value for each row. For instance, here is my matrix, (simply generate with matrix(sample(12),nrow = 3)). With the matrix I want to to have a vector (3,4,1) representing the column number which contains the lowest value in each row.How should I do it? It could be duplicated question but I could not find answers.

      [,1] [,2] [,3] [,4]
[1,]   10   11    1   12
[2,]    8    9    7    3
[3,]    2    5    6    4

推荐答案

使用max.col:

max.col(-mat)
# [1] 3 4 1

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