Being half INTP half INFP is theoretically impossible if you go by the cognitive functions.
INTP cognitive functions in order from dominant to inferior - Ti, Ne, Si, Fe
INFP cognitive functions in order from dominant to inferior - Fi, Ne, Si, Te
They might share the second and third function, but their modus operandi is completely different.
I would advise you to take the cognitive function test and go from there.
It's entirely possible that you're simply an INFP that developed an appreciation for logic.