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
Use max.col:
max.col(-mat)
# [1] 3 4 1
来源：https://stackoverflow.com/questions/49203020/find-the-column-with-lowest-value-in-r