Compute the Box-Cox transformation of 1 + x.
The Box-Cox transformation computed by boxcox1p is:
y = ((1+x)**lmbda - 1) / lmbda if lmbda != 0
log(1+x) if lmbda == 0
Returns nan if x < -1. Returns -inf if x == -1 and lmbda < 0.
New in version 0.14.0.
Parameters: | x : array_like
lmbda : array_like
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Returns: | y : array
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Examples
>> boxcox1p(1e-4, [0, 0.5, 1]) array([ 9.99950003e-05, 9.99975001e-05, 1.00000000e-04]) >>> boxcox1p([0.01, 0.1], 0.25) array([ 0.00996272, 0.09645476])