摘要: a = matrix( c(2, 4, 3, 1, 5, 7), # the data elements nrow=2, # number of rows ncol=3, # number of columns byrow = TRUE) # fill matrix by rows class( (阅读全文
posted @ 2018-05-25 02:12 emanlee 阅读(46) 评论(0) 编辑