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<?php
namespace Matrix\Operators;
use Matrix\Matrix;
use Matrix\Exception;
class DirectSum extends Operator
{
/**
* Execute the addition
*
* @param mixed $value The matrix or numeric value to add to the current base value
* @return $this The operation object, allowing multiple additions to be chained
* @throws Exception If the provided argument is not appropriate for the operation
*/
public function execute($value): Operator
{
if (is_array($value)) {
$value = new Matrix($value);
}
if ($value instanceof Matrix) {
return $this->directSumMatrix($value);
}
throw new Exception('Invalid argument for addition');
}
/**
* Execute the direct sum for a matrix
*
* @param Matrix $value The numeric value to concatenate/direct sum with the current base value
* @return $this The operation object, allowing multiple additions to be chained
**/
private function directSumMatrix($value): Operator
{
$originalColumnCount = count($this->matrix[0]);
$originalRowCount = count($this->matrix);
$valColumnCount = $value->columns;
$valRowCount = $value->rows;
$value = $value->toArray();
for ($row = 0; $row < $this->rows; ++$row) {
$this->matrix[$row] = array_merge($this->matrix[$row], array_fill(0, $valColumnCount, 0));
}
$this->matrix = array_merge(
$this->matrix,
array_fill(0, $valRowCount, array_fill(0, $originalColumnCount, 0))
);
for ($row = $originalRowCount; $row < $originalRowCount + $valRowCount; ++$row) {
array_splice(
$this->matrix[$row],
$originalColumnCount,
$valColumnCount,
$value[$row - $originalRowCount]
);
}
return $this;
}
}