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sample_without_replacement refactored #196

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Sep 19, 2015
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sample_without_replacement refactored #196

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10 changes: 4 additions & 6 deletions quantecon/random/utilities.py
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Original file line number Diff line number Diff line change
Expand Up @@ -124,16 +124,14 @@ def sample_without_replacement(n, k, num_trials=None, random_state=None):

# Logic taken from random.sample in the standard library
result = np.empty((m, k), dtype=int)
pool = np.empty((m, n), dtype=int)
pool = np.empty(n, dtype=int)
for i in range(m):
for j in range(n):
pool[i, j] = j

for i in range(m):
pool[j] = j
for j in range(k):
idx = int(np.floor(r[i, j] * (n-j))) # np.floor returns a float
result[i, j] = pool[i, idx]
pool[i, idx] = pool[i, n-j-1]
result[i, j] = pool[idx]
pool[idx] = pool[n-j-1]

if num_trials is None:
return result[0]
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