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NDArray::sum

public static function sum(NDArray|array|float|int $a, ?int $axis = NULL): NDArray|float|int;

Calculates the sum of array elements along a given axis.

Parameters​

$a​

Type NDArray|array

  • The input array.

$axis​

Type long

  • Specifies the axis along which the sum is performed. By default, (axis=NULL), the function sums all elements of the input array.

Return​

Type - NDArray double

  • The function returns the summed array along the specified axis, resulting in an array with the same shape as the input array, but with the specified axis removed. If the input array is 0-dimensional or if axis=NULL, a scalar value is returned.

Notes​

tip

GPU SUPPORTED​

This operation is supported by GPU (VRAM) and contains a custom CUDA kernel.