All Combinations

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All Combinations

Given this list List(’A’, ‘B’, ‘C’, ‘D’), return this result:
This is how one might implement it in python. I got this from the python itertools package, but I didn’t manage to convert it to Coda language. Index incrementing (the highlighted purple part) proved difficult.
def combinations(iterable, r): # combinations('ABCD', 2) --> AB AC AD BC BD CD # combinations(range(4), 3) --> 012 013 023 123 pool = tuple(iterable) poolsz = len(pool) if r > n: return indices = list(range(r)) yield tuple(pool[i] for i in indices) while True: # make sure that we're not doing the base case (e.g. ABCD of Comb('ABCD', 4)) for i in reversed(range(r)): if indices[i] != i + poolsz - r: break else: return indices[i] += 1 for j in range(i+1, r): indices[j] = indices[j-1] + 1 yield tuple(pool[i] for i in indices)

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