Are there numbers next to the rows? If the numbers go like this 1,3,5,7,....(or 2,4,6,8,....) then there is only every second row charted. If so, then you purl the other rows, except maybe the edge, which should be specified (i.e. keep a border of 3 stitches. then you knit every 3 stitches and 3 last stitches on every row)
Does that make sense? Or even help?