Compute ratios for all strings in list (feature request)

[mscuthbert]

Hello, I'm a very poor c programmer, so unfortunately, this request is a bit beyond me, but one of the things that would be extremely helpful is to be able to give a list of sequences/strings and to return a list of lists of ratios between each pair of ratios (obviously, it could be done so that sequence 1 has a list of n-1, sequence 2 has a list of length n-2, etc. -- how it's done doesn't really matter).

For my purposes (computing ratios among a whole slew of sequences) I've measured the speed limiting factor as the transfer of data to and from the c-code, so I believe that transferring all the data once would give an enormous speed increase. Even transferring a list of sequences to get ratios against one string would be a big speedup I believe.

I'd be willing to contribute some of the other python tasks (test suite; pure-python fallback implementation) in return for the developers' time on this. Thanks!