method-combination

问题 I'm new to Julia. Is there a way to add up elements from a list that add up to a certain value target? I have done this with Python's itertools library like in the example below but I find it extremely slow for larger datasets. import itertools numbers = [1, 2, 3, 7, 7, 9, 10] result = [seq for i in range(len(numbers), 0, -1) for seq in itertools.combinations(numbers, i) if sum(seq) == 10] print result 回答1: While like mentioned by Kermit the problem is NP-hard, it is still worth knowing how

问题 I'm new to Julia. Is there a way to add up elements from a list that add up to a certain value target? I have done this with Python's itertools library like in the example below but I find it extremely slow for larger datasets. import itertools numbers = [1, 2, 3, 7, 7, 9, 10] result = [seq for i in range(len(numbers), 0, -1) for seq in itertools.combinations(numbers, i) if sum(seq) == 10] print result 回答1: While like mentioned by Kermit the problem is NP-hard, it is still worth knowing how

问题 I'm new to Julia. Is there a way to add up elements from a list that add up to a certain value target? I have done this with Python's itertools library like in the example below but I find it extremely slow for larger datasets. import itertools numbers = [1, 2, 3, 7, 7, 9, 10] result = [seq for i in range(len(numbers), 0, -1) for seq in itertools.combinations(numbers, i) if sum(seq) == 10] print result 回答1: While like mentioned by Kermit the problem is NP-hard, it is still worth knowing how

问题 I'm new to Julia. Is there a way to add up elements from a list that add up to a certain value target? I have done this with Python's itertools library like in the example below but I find it extremely slow for larger datasets. import itertools numbers = [1, 2, 3, 7, 7, 9, 10] result = [seq for i in range(len(numbers), 0, -1) for seq in itertools.combinations(numbers, i) if sum(seq) == 10] print result 回答1: While like mentioned by Kermit the problem is NP-hard, it is still worth knowing how

问题 I've been studying the Common Lisp Object Protocol (CLOS) and I came across one doubt. Does anybody what is the meaning of the 'Standard method combination' and 'Simple method combination' in CLOS? And in the 'Simple method combination' what does it mean to have a 'list' method combination? (defgeneric what-are-you? (obj) (:method-combination list :most-specific-last)) (defmethod what-are-you? list ((obj fixnum)) "I am a FIXNUM") (defmethod what-are-you? list ((obj float)) "I am a FLOAT")