ruby - 如何向二维 Ruby NArray 添加一行？

Question

我想向二维 NArray 添加一行。 NArray 0-7 Tutorial中描述的方式非常复杂 - 我想知道是否有更简单的方法。

所以如果我有两个 NArray:

n1 = [[ 0,  1,  2,  3],
      [ 4,  5,  6,  7],
      [ 8,  9, 10, 11],
      [12, 13, 14, 15]]

n2 = [16, 17, 18, 19]

我想添加 n1 和 n2 以获得 n3:

n3 = [[ 0,  1,  2,  3],
      [ 4,  5,  6,  7],
      [ 8,  9, 10, 11],
      [12, 13, 14, 15],
      [16, 17, 18, 19]]

如何做到这一点？

Answer 1

require "narray"

class NArray
  def concat(other)
    shp = self.shape
    shp[1] += 1
    a = NArray.new(self.typecode,*shp)
    a[true,0...-1] = self
    a[true,-1] = other
    return a
  end
end

n1 = NArray[[ 0,  1,  2,  3],
            [ 4,  5,  6,  7],
            [ 8,  9, 10, 11],
            [12, 13, 14, 15]]

n2 = NArray[16, 17, 18, 19]

p n1.concat(n2)
# => NArray.int(4,5):
#    [ [ 0, 1, 2, 3 ],
#      [ 4, 5, 6, 7 ],
#      [ 8, 9, 10, 11 ],
#      [ 12, 13, 14, 15 ],
#      [ 16, 17, 18, 19 ] ]