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NDArray Creation

You can create an NDArray using one of the following ways:

  • From a PHP array
  • Using one of the initialization methods like NDArray::ones
  • From a GD image

Convert PHP Array to NDArray​

In the example below we will create a matrix of size 2 x 2 from an array in PHP

use \NDArray as nd;

$ndarray = new nd([[1, 2], [3, 4]]);
note

Boolean casting​

Boolean values in a PHP array will be converted to floats during initialization

Using initializers​

You can also use one of several available initialization methods, below we will initialize a 2 x 4 x 4 NDArray full of ones.

<?php
use \NDArray as nd;

$ndarray = nd::ones([2, 4, 4]);
print_r($ndarray);
Output
[[[1, 1, 1, 1],
  [1, 1, 1, 1],
  [1, 1, 1, 1],
  [1, 1, 1, 1]],
 [[1, 1, 1, 1],
  [1, 1, 1, 1],
  [1, 1, 1, 1],
  [1, 1, 1, 1]]]

Creating NDArray from an image​

If you want to work with images, NumPower offers a quick way to perform image processing. You can initialize an NDArray from a GD image:

<?php
use \NDArray as nd;

// Use GD to load the image
$originalImage = imagecreatefromjpeg('test_img.jpg');

// Initialize our GD image (1200x1920) NDArray
$image_array = nd::array($originalImage);
print_r($image_array->shape());
Output
Array
(
    [0] => 3
    [1] => 1200
    [2] => 1920
)
note

For now, all images are processed in RGB format, we will work to implement other formats like CMYK and ARGB.