/**
* Check to see if matrix is square: m by m
*
* @access protected
* @param Matrix $matrix
*/
public function checkSquare(Matrix $matrix)
{
if ($matrix->getColumns() != $matrix->getRows()) {
throw new MatrixException('Matrices is not square: ' . $matrix->getRows() . ' by ' . $matrix->getColumns());
}
return true;
}
/**
* Transpose function
*
* Returns the transpose of the matrix
*
* @param Matrix $matrix
* @return matrix The matrix's transpose
*/
public function transpose(Matrix $matrix)
{
$rows = $matrix->getRows();
$columns = $matrix->getColumns();
$newMatrix = $this->zero($columns, $rows);
for ($i = 1; $i <= $rows; $i++) {
for ($j = 1; $j <= $columns; $j++) {
$newMatrix->setElement($j, $i, $matrix->getElement($i, $j));
}
}
return $newMatrix;
}
/**
* Scalar Multiply function
*
* Multiplies this matrix against a scalar value
*
* @param Matrix $matrix
* @param float $scalar The scalar value
* @return matrix The multiplied matrix
*/
public function scalarMultiply(Matrix $matrix, $scalar)
{
$rows = $matrix->getRows();
$columns = $matrix->getColumns();
$newMatrix = $this->builder->zero($rows, $columns);
for ($i = 1; $i <= $rows; $i++) {
for ($j = 1; $j <= $columns; $j++) {
$newMatrix->setElement($i, $j, $matrix->getElement($i, $j) * $scalar);
}
}
return $newMatrix;
}