r - How to concatenate strings in a specified order

Monday, July 22, 2019

Tried to concatenate strings diagonally from this post how to alternatively concatenate 3 strings, but was not successful.

My input is:

a<-c("a1","a2","a3")
b<-c("b1","b2","b3")
c<-c("c1","c2","c3")

My expected output would be

   "a1" "b2" "c3" "a2" "b3" "a3"

How to get the above from

  c(rbind(a,b,c))

Answer

How about ordering the vector by values derived by the row and columns after setting the lower diagonal to missing

mat <- rbind(a,b,c)

mat[lower.tri(mat)] <- NA
na.omit(mat[order(col(mat) - row(mat))])

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