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More tests more resistance to mutation testing.
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This commit is contained in:
Jens True
2024-07-25 11:23:59 +00:00
parent 1b7e26a6b5
commit f6acee18e5
6 changed files with 184 additions and 25 deletions
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49
src/Numerics/Matrix.php
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@ -60,13 +60,34 @@ class Matrix
return $this->columnCount;
}
private function checkRowCol(int $row, int $col): void
{
if ($row < 0) {
throw new Exception("Row negative");
}
if ($row >= $this->getRowCount()) {
throw new Exception("Row beyond range");
}
if ($col < 0) {
throw new Exception("Column negative");
}
if ($col >= $this->getColumnCount()) {
throw new Exception("Column beyond range");
}
}
public function getValue(int $row, int $col): float|int
{
$this->checkRowCol($row, $col);
return $this->matrixRowData[$row][$col];
}
public function setValue(int $row, int $col, float|int $value): void
{
$this->checkRowCol($row, $col);
$this->matrixRowData[$row][$col] = $value;
}
@ -100,7 +121,7 @@ class Matrix
if ($this->rowCount == 1) {
// Really happy path :)
return $this->matrixRowData[0][0];
return $this->getValue(0, 0);
}
if ($this->rowCount == 2) {
@ -109,10 +130,10 @@ class Matrix
// | a b |
// | c d |
// The determinant is ad - bc
$a = $this->matrixRowData[0][0];
$b = $this->matrixRowData[0][1];
$c = $this->matrixRowData[1][0];
$d = $this->matrixRowData[1][1];
$a = $this->getValue(0, 0);
$b = $this->getValue(0, 1);
$c = $this->getValue(1, 0);
$d = $this->getValue(1, 1);
return $a * $d - $b * $c;
}
@ -127,7 +148,7 @@ class Matrix
// I expand along the first row
for ($currentColumn = 0; $currentColumn < $this->columnCount; ++$currentColumn) {
$firstRowColValue = $this->matrixRowData[0][$currentColumn];
$firstRowColValue = $this->getValue(0, $currentColumn);
$cofactor = $this->getCofactor(0, $currentColumn);
$itemToAdd = $firstRowColValue * $cofactor;
$result += $itemToAdd;
@ -152,10 +173,10 @@ class Matrix
// | d -b |
// | -c a |
$a = $this->matrixRowData[0][0];
$b = $this->matrixRowData[0][1];
$c = $this->matrixRowData[1][0];
$d = $this->matrixRowData[1][1];
$a = $this->getValue(0, 0);
$b = $this->getValue(0, 1);
$c = $this->getValue(1, 0);
$d = $this->getValue(1, 1);
return new SquareMatrix(
$d,
@ -180,7 +201,7 @@ class Matrix
public function getInverse(): Matrix|SquareMatrix
{
if (($this->rowCount == 1) && ($this->columnCount == 1)) {
return new SquareMatrix(1.0 / $this->matrixRowData[0][0]);
return new SquareMatrix(1.0 / $this->getValue(0, 0));
}
// Take the simple approach:
@ -262,6 +283,7 @@ class Matrix
private function getMinorMatrix(int $rowToRemove, int $columnToRemove): Matrix
{
$this->checkRowCol($rowToRemove, $columnToRemove);
// See http://en.wikipedia.org/wiki/Minor_(linear_algebra)
// I'm going to use a horribly naïve algorithm... because I can :)
@ -281,7 +303,7 @@ class Matrix
continue;
}
$result[$actualRow][$actualCol] = $this->matrixRowData[$currentRow][$currentColumn];
$result[$actualRow][$actualCol] = $this->getValue($currentRow, $currentColumn);
++$actualCol;
}
@ -294,6 +316,7 @@ class Matrix
public function getCofactor(int $rowToRemove, int $columnToRemove): float
{
$this->checkRowCol($rowToRemove, $columnToRemove);
// See http://en.wikipedia.org/wiki/Cofactor_(linear_algebra) for details
// REVIEW: should things be reversed since I'm 0 indexed?
$sum = $rowToRemove + $columnToRemove;
@ -316,7 +339,7 @@ class Matrix
for ($currentColumn = 0; $currentColumn < $this->columnCount; ++$currentColumn) {
$delta =
abs(
$this->matrixRowData[$currentRow][$currentColumn] -
$this->getValue($currentRow, $currentColumn) -
$otherMatrix->getValue($currentRow, $currentColumn)
);