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Link: http://codepad.org/qkvR2New    [ raw code | output | fork ]

Python, pasted on Nov 4: 
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import math
from itertools import chain


def get_list(n, r):
    def process_coord(x, y):
            base_angle = math.atan2(y, x)
            delta_angle = math.asin(r / (math.sqrt(x * x + y * y)))
            yield (base_angle - delta_angle, 1)
            yield (base_angle + delta_angle, -1)

    return chain.from_iterable(process_coord(x, y) for x in xrange(0, n)
                                                   for y in xrange(0, x)
                                                   if (x * x + y * y < n * n) and (x * x + y * y > 0))


def main():
    l = get_list(100, 0.02)
    print len(list(l))

if __name__ == '__main__':
    main()


Output: 
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Traceback (most recent call last):
  Line 22, in <module>
    main()
  Line 18, in main
    l = get_list(100, 0.02)
  Line 12, in get_list
    return chain.from_iterable(process_coord(x, y) for x in xrange(0, n)
AttributeError: type object 'itertools.chain' has no attribute 'from_iterable'


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