Ruben:

I just checked the convert_warp source code, and confirmed that indeed "--fractional 1" should give you the same transformation as you put in.

Now that said, even in the f=1 case, there is the same arithmetic going on as for any other fractional value, so there will likely be subtle differences due to finite floating point precision. So a binary comparison of the input and output files should be expected to show some differences.

That said, these differences should be very small and should not really affect the result of the reformatting operation (beyond, again, differences on the order of machine precision).

If you want, you can send me your input and output transformations and I'll take a look what's going on.

TR

Originally posted by Ruben Portugues: