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fix std, var units #12

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Merged
lucascolley merged 1 commit into from
Jan 2, 2025
Merged

fix std, var units #12

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16 changes: 13 additions & 3 deletions src/pint_array/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -729,7 +729,6 @@ def set_fun(x, /):
# output_unit="sum":
# `x.units`, unless non-multiplicative, which raises `OffsetUnitCalculusError`
for func_str in (
"std",
"cumulative_sum",
"sum",
):
Expand All @@ -745,6 +744,17 @@ def func(x, /, *args, func_str=func_str, **kwargs):

setattr(mod, func_str, func)

# output_unit="delta"
def std(x, /, **kwargs):
x = asarray(x)
magnitude = xp.asarray(x.magnitude, copy=True)
units = x.units
magnitude = xp.std(magnitude, **kwargs)
units = (1 * units - 1 * units).units
return ArrayUnitQuantity(magnitude, units)

mod.std = std

for func_str in (
"any",
"all",
Expand All @@ -764,14 +774,14 @@ def func(x, /, *args, func_str=func_str, **kwargs):
setattr(mod, func_str, func)

# output_unit="variance":
# square of `x.units`,
# square of delta `x.units`,
# unless non-multiplicative, which raises `OffsetUnitCalculusError`
def var(x, /, *args, **kwargs):
x = asarray(x)
magnitude = xp.asarray(x.magnitude, copy=True)
units = x.units
magnitude = xp.var(magnitude, *args, **kwargs)
units = ((1 * units + 1 * units) ** 2).units
units = ((1 * units - 1 * units) ** 2).units
return ArrayUnitQuantity(magnitude, units)

mod.var = var
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