jax.numpy.nancumsum(a, axis=None, dtype=None, out=None)[source]#

Return the cumulative sum of array elements over a given axis treating Not a

LAX-backend implementation of numpy.nancumsum().

Unlike the numpy counterpart, when dtype is not specified the output dtype will always match the dtype of the input.

Original docstring below.

Numbers (NaNs) as zero. The cumulative sum does not change when NaNs are encountered and leading NaNs are replaced by zeros.

Zeros are returned for slices that are all-NaN or empty.

Added in version 1.12.0.

  • a (array_like) – Input array.

  • axis (int, optional) – Axis along which the cumulative sum is computed. The default (None) is to compute the cumsum over the flattened array.

  • dtype (dtype, optional) – Type of the returned array and of the accumulator in which the elements are summed. If dtype is not specified, it defaults to the dtype of a, unless a has an integer dtype with a precision less than that of the default platform integer. In that case, the default platform integer is used.

  • out (None)


nancumsum – A new array holding the result is returned unless out is specified, in which it is returned. The result has the same size as a, and the same shape as a if axis is not None or a is a 1-d array.

Return type: