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