r语言如何汇总每日病例数

Python014

r语言如何汇总每日病例数,第1张

rowSums, colSums,rowMeans, colMeans 可以简单理解为按行或列求和或求均值，table把数字或字符当成因子统计频度，都相当简单：

1. >a <- array(rep(1:3, each=3), dim=c(3,3))

2. >a

3. >rowSums(a)

4. [1] 6 6 6

5. >colSums(a)

6. [1] 3 6 9

7. >table(a)

=COUNTIFS(E:E,">=20",E:E,"<=40")

=COUNTIFS(E:E,">=41",E:E,"<=60")

=COUNTIF(E:E,">60")