During my PhD interview, due to my good computing skills, I was told I would have worked on the code we use _and_ on the phyiscal analysis of its results.
After more than a year, all problems I discussed with my supervisors (and solved) are _only_ performance technicality about the code we use.
I actually love to code/think of new algorithms and implement improvement, so days are actually flowing pretty productively. And this is why I put in the title "I do not like _so_ much".
Being just productive and useful does not make me really happy.
I'd love to co-operate on the phyisical analysis of our results. And the fact that I am missing the opportunity on working on this sied of our scientific research, demoralizes me.
After all this time I am only "the guy who works on the code" to which no one asks any question related to the phyisical results.
You may tell me to "just" talk with my supervisor about my willing to move to a slightly different direction (since it was even been promised to me). Well, I tried to do it (very shyly I admit), and every time he became vague and do not reply.
In conclusion:
have you ever found yourself in the situation? or in the situation you needed to completely change field? what have you done?
I know all situations and people involved are different, but I could still learn something from your experience.