obelisk2 https://blog.hatena.ne.jp/obelisk2/ Camera Obscura https://obelisk.hatenablog.com/ Ruby class Array def mul(x) m = self.size - 1 n = x.size - 1 c = Array.new(m + 1) c.each_index {|i| c[i] = Array.new(m + 1, 0)} for i in 0..m for j in 0..m for k in 0..n c[i][j] += self[i][k] * x[k][j] end end end c end end a = [[-1, -1, 2], [-1, 2, -1], [2, -1, -1]] b = [[2, -1, 0], [-1, 2, -1], [0, -1,… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fobelisk.hatenablog.com%2Fentry%2F2016%2F01%2F30%2F013016" title="行列の積 - Camera Obscura" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2016-01-30 01:30:16 rich https://obelisk.hatenablog.com/entry/2016/01/30/013016 1.0 100%