linalg:sum

(linalg:sum array &optional axis keepdims)

Returns the sum of every element of a vector or matrix. Like a reduction in numpy, the result follows the element type: a packed double-float array (anything built by a linalg constructor) gives a double, while a plain integer array gives an integer. For the average, use linalg:mean.

With an integer axis (negative counts from the end, numpy's rule) it instead sums along that axis: the axis is dropped from the result -- kept with extent 1 under a non-nil keepdims -- and a vector without keepdims reduces to the scalar itself. A non-nil keepdims with no axis wraps the full sum in an all-ones-shape array, as in numpy.