ruby - 如何反转 ruby​​ 1.9 中的矩阵对象？

Question

我是 Ruby 的初学者。所以我搜索了如何反转矩阵

1, 2, 3,  4    8, 9, 10, 11
4, 5, 6,  7 => 4, 5, 6,  7
8, 9, 10, 11   1, 2, 3,  4

我试过:

require 'matrix'
m = Matrix[ [1,2,3,4],[4,5,6,7], [8,9,10,11] ]
m_rev = Matrix.build(m.row_size, m.column_size){|row|
    m.row_size.downto(0){|i|
        row = m.row(i)
    }
}

Answer 1

尝试:矩阵[*m.to_a.reverse]:

m = Matrix[ [1,2,3,4], [5,6,7,8], [9,10,11,12] ]
 #=> Matrix[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]
r = Matrix[*m.to_a.reverse]
 #=> Matrix[[9, 10, 11, 12], [5, 6, 7, 8], [1, 2, 3, 4]]

不要错过*。