r - Reorder all the columns in a data table based on Other files rows -

i have 1 data.table(dt1) has ids sorted criteria.

1. id10 2. id7757 3. id75340 4. id999 5. id5498 

and 2nd data.table(dt2) id's of first data.table column names.

source    id7757    id8948    id5498    id999     id10    id75340 source1   32        87        643       8676      34      10 source2   65        32        876       9457      8       777 source3   64        666       99        222       66      222 

how can short columns of 2nd data.table based on order of 1st data.table? meaning id on 1st position should 1st column, 2nd position~2nd column etc...

the output file should follows:

source    id10    id7757    id75340    id999    id5498 source1   34      32        10         8676     643 source2   8       65        777        9476     32 source3   66      64        222        222      666 

how can done in r?

it's straight forward this. turns out dataset faulty.

so first sanitize datasets people!

the solution following:

all.sorted <- read.table("sorted.txt", header=t, sep=' ', na.strings="n/a")  sorted.ids <- unlist(all.sorted$id) sorted.ids.sanitized <- make.names(sorted.ids)  sorted.variants <- sorted.ids.sanitized # step check if , keep copy of original sorted.variants <- as.character(sorted.variants)  new.order <- dt2[, sorted.variants]