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Parses an ab setting into rational numbers a and b.
parse_ab(s)A list of the following elements:
The numerator of a.
The denominator of a.
The numerator of b.
The denominator of b.
A string starting with "ab_", followed by rational numbers a and b separated by "_". a and b must be integers or rational numbers of the form "int/int". See examples.
parse_ab("ab_1_1") # gaussian: a = 1, b = 1
parse_ab("ab_2_5/4") # a = 2, b = 5/4
parse_ab("ab_5/4_3/2") # a = 5/4, b = 3/2
parse_ab("ab_3/2_0/0") # a = 3/2, b = 0/0 (log)
parse_ab("ab_1/2_0/0") # exp: a = 1/2, b = 0/0 (log)
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