Hi Eleftherios, just to put this in context. This is not an actual pull request, this is just meant to demonstrate how nipype and dipy *might* work together. I choose this function to work with because I thought it would serve as a good example. I wrote this script a long time ago primary for use here at UCSF and included it in dipy when I got feedback that others thought it was useful. I'm happy to spend some more time making it more useful, but the reason I created this PR and ping chris on the PR is to follow up on our earlier discussions about nipype dipy interoperability. I really would like to separate out the two discussion, I think discussing the merits of this script and the the interoperability issues in once place makes the conversation very hard to follow.