search for: na18504

Hi there, Wonder if someone who is R-savvy can help me with the following task (see below) that I occasionally do work and gets quite tedious if I do it manually. Thanks in advance! jenny. ----------------- I have a column of data that looks like this: NA18501 NA18502 NA18504 NA18505 NA18507 NA18508 NA18516 NA18517 NA18522 NA18523 And I want to duplicate the values and sort of "interweave" them to look like this: NA18501 NA18501 NA18502 NA18502 NA18504 NA18504 NA18505 NA18505 NA18507 NA18507 NA18508 NA18508 NA18516 NA18516 NA18517 NA18517 NA18522 NA18522 NA...