NDArray::subtract

public static function subtract(NDArray|array|float|int $a, NDArray|array|float|int $b): NDArray|float|int;

Subtract two arrays element-wise

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Parameters

$a $b

• Type - NDArray | array | scalar
• Input arrays

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Return

NDArray

• Element-wise subtraction of $a and $b element-wise

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Notes

tip

GPU SUPPORTED

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

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Examples

Example 1

use \NDArray as nd;

$a = new nd([[1, 2], [3, 4]]);
$b = new nd([[1, 2], [3, 4]]);

$c = nd::subtract($a, $b);

print_r($c);

[[0, 0],
 [0, 0]]

Example 2

use \NDArray as nd;

$c = nd::subtract([1, 2, 3], [10, 10, 10]);

print_r($c);

[-9, -8, -7]

Example 3

use \NDArray as nd;

$a = new nd([[1, 2], [3, 4]]);
$b = new nd([[1, 2], [3, 4]]);

$c = $a - $b;

print_r($c);

[[0, 0],
 [0, 0]]