66 lines
2.0 KiB
PHP
66 lines
2.0 KiB
PHP
<?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 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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* @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)
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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 $this->directSumMatrix($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 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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* @throws Exception If the provided argument is not appropriate for the operation
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**/
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protected function directSumMatrix(Matrix $value)
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{
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$originalColumnCount = count($this->matrix[0]);
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$originalRowCount = count($this->matrix);
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$additionalColumnCount = $value->columns;
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$additionalRowCount = $value->rows;
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$value = $value->toArray();
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for ($row = 0; $row < $this->rows; ++$row) {
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$this->matrix[$row] = array_merge($this->matrix[$row], array_fill(0, $additionalColumnCount, 0));
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}
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$this->matrix = array_merge(
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$this->matrix,
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array_fill(0, $additionalRowCount, array_fill(0, $originalColumnCount, 0))
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);
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for ($row = $originalRowCount; $row < $originalRowCount + $additionalRowCount; ++$row) {
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array_splice(
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$this->matrix[$row],
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$originalColumnCount,
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$additionalColumnCount,
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$value[$row - $originalRowCount]
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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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