学习R:matrix()函数录入矩阵数据
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matrix(c(20,30,40,35,50,180,170,160,165,150))
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matrix(c(20,30,40,35,50,180,170,160,165,150),nrow = 5,ncol = 2)
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matrix(c(20,30,40,35,50,180,170,160,165,150),nrow = 5,ncol = 2,dimnames = list(year=c(2011:2015),outcome=c("发病","未发病")))
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