摘要: # Create test matrix(造数据) set.seed(6) test = matrix(rnorm(200), 20, 10) test[1:10, seq(1, 10, 2)] = test[1:10, seq(1, 10, 2)] + 3 test[11:20, seq(2, 1 阅读全文
posted @ 2023-03-12 23:54 歪歪ba 阅读(915) 评论(0) 推荐(0) 编辑