vstack(*matrices) -> Matrix
[permalink][rdoc]行列 matrices を縦に並べた行列を生成します。
require 'matrix'
x = Matrix[[1, 2], [3, 4]]
y = Matrix[[5, 6], [7, 8]]
Matrix.vstack(x, y) # => Matrix[[1, 2], [3, 4], [5, 6], [7, 8]]
[SEE_ALSO] Matrix.hstack, Matrix#vstack