implement calculation of balance functions #1
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A wrong index was used, which resulted in nans. Also made sure the code works for $p = 0$.
They have been calculated incorrectly. The charge-only balance function still does not look right.
Instead output the numerator and denominator separately. This has the advantage that the results of several separate runs can be easily combined, because the division can be delayed until the last step, right before plotting the balance function.
This ensures deterministic results while giving different results for parallel runs.
The wrong signs were used, so B(pi+, pi-) was negative instead of positive. This is fixed here. Note that B(p, pbar) still seems to have the wrong sign for some reason.
This is a slight refactoring of Scott's and Garry's code. Use switch statements where appropriate (in one case this should improve performance) and return structs instead of modifying parameters.
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Can you tell me whether this looks good? (The code compiles, it is untested however.)