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Fix: more stable std computation #2292

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Fix: more stable std computation #2292

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2 changes: 1 addition & 1 deletion packages/vaex-core/vaex/agg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -520,7 +520,7 @@ def finish(sum_moment1, sum_moment2, sum_moment3, sum_moment4, count):

class AggregatorDescriptorStd(AggregatorDescriptorVar):
def finish(self, value):
return value**0.5
return np.abs(value)**0.5

@register
def count(expression='*', selection=None, edges=False):
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2 changes: 1 addition & 1 deletion packages/vaex-core/vaex/dataframe.py
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Expand Up @@ -1164,7 +1164,7 @@ def std(self, expression, binby=[], limits=None, shape=default_shape, selection=
"""
@delayed
def finish(var):
return var**0.5
return np.abs(var)**0.5
return self._delay(delay, finish(self.var(expression, binby=binby, limits=limits, shape=shape, selection=selection, delay=True, progress=progress)))

@docsubst
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