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<?php |
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|
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namespace Matrix\Operators; |
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|
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use Matrix\Matrix; |
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use Matrix\Exception; |
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|
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class Subtraction extends Operator |
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{ |
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/** |
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* Execute the subtraction |
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* |
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* @param mixed $value The matrix or numeric value to subtract from the current base value |
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* @throws Exception If the provided argument is not appropriate for the operation |
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* @return $this The operation object, allowing multiple subtractions to be chained |
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**/ |
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public function execute($value) |
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{ |
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if (is_array($value)) { |
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$value = new Matrix($value); |
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} |
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|
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if (is_object($value) && ($value instanceof Matrix)) { |
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return $this->subtractMatrix($value); |
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} elseif (is_numeric($value)) { |
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return $this->subtractScalar($value); |
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} |
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|
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throw new Exception('Invalid argument for subtraction'); |
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} |
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|
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/** |
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* Execute the subtraction for a scalar |
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* |
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* @param mixed $value The numeric value to subtracted from the current base value |
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* @return $this The operation object, allowing multiple additions to be chained |
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**/ |
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protected function subtractScalar($value) |
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{ |
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for ($row = 0; $row < $this->rows; ++$row) { |
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for ($column = 0; $column < $this->columns; ++$column) { |
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$this->matrix[$row][$column] -= $value; |
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} |
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} |
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|
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return $this; |
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} |
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|
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/** |
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* Execute the subtraction for a matrix |
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* |
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* @param Matrix $value The numeric value to subtract from the current base value |
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* @return $this The operation object, allowing multiple subtractions to be chained |
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* @throws Exception If the provided argument is not appropriate for the operation |
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**/ |
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protected function subtractMatrix(Matrix $value) |
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{ |
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$this->validateMatchingDimensions($value); |
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|
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for ($row = 0; $row < $this->rows; ++$row) { |
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for ($column = 0; $column < $this->columns; ++$column) { |
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$this->matrix[$row][$column] -= $value->getValue($row + 1, $column + 1); |
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} |
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} |
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|
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return $this; |
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} |
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} |
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