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February 14, 2018 15:44
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Function that tests if a point belongs to a interval modulo (i.e. an arc of circle)
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| def belongs_to(t, a, b): | |
| """Return True if t belongs to real number interval [a, b], False otherwise.""" | |
| return t >= a and t <= b | |
| def is_in_arc(t, a, b, m=365): | |
| """Return True if t is in the interval [a, b] modulo m, False otherwise""" | |
| t, a, b = [x % m for x in (t, a, b)] # convert all the values to their values modulo m | |
| if a < b: | |
| return belongs_to(t, a, b) | |
| else: | |
| return not belongs_to(t, b, a) |
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Useful for testing if a day-of-year is on a given day-of-year interval