- nlcpy.cumsum(a, axis=None, dtype=None, out=None)
Returns the cumulative sum of the elements along a given axis.
- axisint, optional
Axis along which the cumulative sum is computed. The default (None) is to compute the cumsum over the flattened array.
- dtypedtype, 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 dtype is nlcpy.int32. unless dtype is nlcpy.int32.
- outndarray, optional
Alternative output array in which to place the result. It must have the same shape and buffer length as the expected output but the type will be cast if necessary.
A new array holding the result is returned unless out is specified, in which case a reference to out 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.
Arithmetic is modular when using integer types, and no error is raised on overflow.
>>> import nlcpy as vp >>> a = vp.array([[1,2,3], [4,5,6]]) >>> a array([[1, 2, 3], [4, 5, 6]]) >>> vp.cumsum(a) array([ 1, 3, 6, 10, 15, 21]) >>> vp.cumsum(a, dtype=float) array([ 1., 3., 6., 10., 15., 21.]) >>> vp.cumsum(a, axis=0) array([[1, 2, 3], [5, 7, 9]]) >>> vp.cumsum(a, axis=1) array([[ 1, 3, 6], [ 4, 9, 15]])