This question is about magnetic field of a solenoid.

Is the axial magnetic field inside a solenoid positive or negative and WHY? If it is negative how do we make it positive for plotting magnetic field versus current using PASCO Capstone

(Please if you have worked with PASCO software you should understand the question and not ask for more information since this is a very general question). In any case if you genuinely do need more information, please ask