Viewing file:  Multiplication.php (2.45 KB) -rw-r--r--
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<?php
namespace Matrix\Operators;
use Matrix\Matrix;
use \Matrix\Builder;
use Matrix\Exception;
class Multiplication extends Operator
{
/**
* Execute the multiplication
*
* @param mixed $value The matrix or numeric value to multiply the current base value by
* @throws Exception If the provided argument is not appropriate for the operation
* @return $this The operation object, allowing multiple multiplications to be chained
**/
public function execute($value): Operator
{
if (is_array($value)) {
$value = new Matrix($value);
}
if (is_object($value) && ($value instanceof Matrix)) {
return $this->multiplyMatrix($value);
} elseif (is_numeric($value)) {
return $this->multiplyScalar($value);
}
throw new Exception('Invalid argument for multiplication');
}
/**
* Execute the multiplication for a scalar
*
* @param mixed $value The numeric value to multiply with the current base value
* @return $this The operation object, allowing multiple mutiplications to be chained
**/
protected function multiplyScalar($value): Operator
{
for ($row = 0; $row < $this->rows; ++$row) {
for ($column = 0; $column < $this->columns; ++$column) {
$this->matrix[$row][$column] *= $value;
}
}
return $this;
}
/**
* Execute the multiplication for a matrix
*
* @param Matrix $value The numeric value to multiply with the current base value
* @return $this The operation object, allowing multiple mutiplications to be chained
* @throws Exception If the provided argument is not appropriate for the operation
**/
protected function multiplyMatrix(Matrix $value): Operator
{
$this->validateReflectingDimensions($value);
$newRows = $this->rows;
$newColumns = $value->columns;
$matrix = Builder::createFilledMatrix(0, $newRows, $newColumns)
->toArray();
for ($row = 0; $row < $newRows; ++$row) {
for ($column = 0; $column < $newColumns; ++$column) {
$columnData = $value->getColumns($column + 1)->toArray();
foreach ($this->matrix[$row] as $key => $valueData) {
$matrix[$row][$column] += $valueData * $columnData[$key][0];
}
}
}
$this->matrix = $matrix;
return $this;
}
}
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