public void FindFirstRowOfNonZeroElementInColumn_WithAllZeroesInColumnExceptAtRowOne_ReturnsOne()
{
// Arrange
double[,] M = new double[, ]
{
{ 1, 0, 3 },
{ 4, 1, 6 },
{ 7, 0, 9 }
};
// Act
int result = MatrixHelpers.FindFirstRowOfNonZeroElementInColumn(1, M);
// Assert
Assert.AreEqual(1, result);
}
public void FindFirstRowOfNonZeroElementInColumn_WithNonZeroInTheFirstButZeroesInLowerRowsOfTheColumn_ReturnsZero()
{
// Arrange
double[,] M = new double[, ]
{
{ 1, 2, 3 },
{ 4, 0, 6 },
{ 7, 0, 9 }
};
// Act
int result = MatrixHelpers.FindFirstRowOfNonZeroElementInColumn(1, M);
// Assert
Assert.AreEqual(0, result);
}
public void FindFirstRowOfNonZeroElementInColumn_WithAllZeroesInColumnButStartingAtRowOne_ReturnsMinusOne()
{
// Arrange
double[,] M = new double[, ]
{
{ 1, 0, 3 },
{ 4, 0, 6 },
{ 7, 0, 9 }
};
// Act
int result = MatrixHelpers.FindFirstRowOfNonZeroElementInColumn(1, M, startAtRow: 1);
// Assert
Assert.AreEqual(-1, result);
}
public void FindFirstRowOfNonZeroElementInColumn_WithAllNonZeroesInColumn_ReturnsZero()
{
// Arrange
double[,] M = new double[, ]
{
{ 1, 2, 3 },
{ 4, 5, 6 },
{ 7, 6, 9 }
};
// Act
int result = MatrixHelpers.FindFirstRowOfNonZeroElementInColumn(1, M);
// Assert
Assert.AreEqual(0, result);
}
public void FindFirstRowOfNonZeroElementInColumn()
{
int _ = MatrixHelpers.FindFirstRowOfNonZeroElementInColumn(
Columns / 2, _M);
}
