cara membuat matriks dengan membuat fungsi matrix(),di dalamnya kita isi dengan data sebanyak 25, yang terdiri dari 1 sampai 25,yg mana terdapat baris yang ditunjukan nrow=5 dan ditunjukan kolom ncol = 5

A <- matrix(data = 1:25, nrow = 5, ncol = 5, byrow = TRUE)
A
##      [,1] [,2] [,3] [,4] [,5]
## [1,]    1    2    3    4    5
## [2,]    6    7    8    9   10
## [3,]   11   12   13   14   15
## [4,]   16   17   18   19   20
## [5,]   21   22   23   24   25

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