How to order a specific row in a matrix?-CodePudding

    tt<-c(3,2,3,5,3,5,5,4,3,1,5,2,1,5,4,1,3,5,3,3)
    ff<-matrix(tt,nrow=5)
    print(ff)
    print(t(apply(ff,1,sort)))

I want to order the second row only by ascending order not all rows, but it always show me all rows.

CodePudding user response：

You can order assign the order to the second row only:

tt<-c(3,2,3,5,3,5,5,4,3,1,5,2,1,5,4,1,3,5,3,3)
ff<-matrix(tt,nrow=5)
ff[2, ] <- ff[2, ][order(ff[2, ])]
print(ff)
     [,1] [,2] [,3] [,4]
[1,]    3    5    5    1
[2,]    2    2    3    5
[3,]    3    4    1    5
[4,]    5    3    5    3
[5,]    3    1    4    3

CodePudding user response：

ff[2, ] <- sort(ff[2, ])
ff
#      [,1] [,2] [,3] [,4]
# [1,]    3    5    5    1
# [2,]    2    2    3    5
# [3,]    3    4    1    5
# [4,]    5    3    5    3
# [5,]    3    1    4    3