Hi, As I needed a byteswap() method for recarray, after a bit of hacking I've made one myself. This is based on my own version of recarray to take advantage of the _fields cache so as to both speed-up and simplify the new code. Basically, the new method takes a recarray, checking which columns are numarray arrays and invoking their byteswap() method if needed. Easy, but effective. Moreover, a _byteswap() and togglebyteorder() are provided to be compatible with existing methods in NumArray objects. As a plus, the recarray __str__ has been modified in order to allow a printing having in mind the byteorder of the recarray, and improving the speed of printing by a factor of 30, that can be handy in some situations. Do with it whatever you want, -- Francesc Alted