ENH add sample #2419 #7274
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ENH add sample #2419 #7274
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| @@ -297,3 +297,20 @@ def _bucket_labels(series, k): | |||
| mat[v] = i | |||
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| return mat + 1 | |||
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| def choice(arr, size, replace): | |||
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forgot that arr can be an int. Also, I should make the private.
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we don't need this anymore since we require numpy 1.7 now
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closing for now. @hayd if you want to update at some point, ok,. |
| except ImportError: | ||
| from pandas.stats.misc import choice | ||
| msk = choice(len(self), size, replace=replace) | ||
| return self.iloc[msk] |
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This should use take, which is faster
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Just wrote a little utility function to do this, so I may pick this up. def sample_n(df, size, replace=False, weight=None, seed=None):
rs = np.random.RandomState(seed)
locs = rs.choice(df.shape[0], size=size, replace=replace, p=weight)
return df.take(locs, axis=0) |
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fixes #2419
Hmmm
np.random.choicenot available on numpy < 1.7.