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<?php
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namespace Matrix\Operators;
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use Matrix\Matrix;
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use Matrix\Exception;
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class Addition 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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* @throws Exception If the provided argument is not appropriate for the operation
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* @return $this The operation object, allowing multiple additions to be chained
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**/
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public function execute($value): Operator
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{
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if (is_array($value)) {
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$value = new Matrix($value);
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}
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if (is_object($value) && ($value instanceof Matrix)) {
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return $this->addMatrix($value);
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} elseif (is_numeric($value)) {
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return $this->addScalar($value);
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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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* Execute the addition for a scalar
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*
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* @param mixed $value The numeric value to add to the current base value
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* @return $this The operation object, allowing multiple additions to be chained
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**/
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protected function addScalar($value): Operator
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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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return $this;
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}
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/**
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* Execute the addition for a matrix
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*
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* @param Matrix $value The 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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protected function addMatrix(Matrix $value): Operator
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{
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$this->validateMatchingDimensions($value);
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for ($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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return $this;
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}
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}
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