/// <summary>
/// Compute the dot product for two matrixes. Note: both matrixes must be vectors.
/// </summary>
/// <param name="a">The first matrix, must be a vector.</param>
/// <param name="b">The second matrix, must be a vector.</param>
/// <returns>The dot product of the two matrixes.</returns>
public static double DotProduct(Matrix a, Matrix b)
{
if (!a.IsVector() || !b.IsVector())
{
throw new MatrixError(
"To take the dot product, both matrixes must be vectors.");
}
Double[] aArray = a.ToPackedArray();
Double[] bArray = b.ToPackedArray();
if (aArray.Length != bArray.Length)
{
throw new MatrixError(
"To take the dot product, both matrixes must be of the same length.");
}
double result = 0;
int length = aArray.Length;
for (int i = 0; i < length; i++)
{
result += aArray[i] * bArray[i];
}
return(result);
}
/// <summary>
/// Calculate the vector length of the matrix.
/// </summary>
/// <param name="input">The vector to calculate for.</param>
/// <returns>The vector length.</returns>
public static double VectorLength(Matrix input)
{
if (!input.IsVector())
{
throw new MatrixError(
"Can only take the vector length of a vector.");
}
Double[] v = input.ToPackedArray();
double rtn = 0.0;
for (int i = 0; i < v.Length; i++)
{
rtn += Math.Pow(v[i], 2);
}
return(Math.Sqrt(rtn));
}
public void IsVector()
{
double[] matrixData = { 1.0, 2.0, 3.0, 4.0 };
Matrix matrixCol = Matrix.CreateColumnMatrix(matrixData);
Matrix matrixRow = Matrix.CreateRowMatrix(matrixData);
Assert.IsTrue(matrixCol.IsVector());
Assert.IsTrue(matrixRow.IsVector());
double[][] matrixData2 =
{
new[] { 1.0, 2.0 },
new[] { 3.0, 4.0 }
};
var matrix = new Matrix(matrixData2);
Assert.IsFalse(matrix.IsVector());
}
public void IsVector()
{
double[] matrixData = {1.0, 2.0, 3.0, 4.0};
Matrix matrixCol = Matrix.CreateColumnMatrix(matrixData);
Matrix matrixRow = Matrix.CreateRowMatrix(matrixData);
Assert.IsTrue(matrixCol.IsVector());
Assert.IsTrue(matrixRow.IsVector());
double[][] matrixData2 = {
new[] {1.0, 2.0},
new[] {3.0, 4.0}
};
var matrix = new Matrix(matrixData2);
Assert.IsFalse(matrix.IsVector());
}
/// <summary>
/// Calculate the vector length of the matrix.
/// </summary>
/// <param name="input">The vector to calculate for.</param>
/// <returns>The vector length.</returns>
public static double VectorLength(Matrix input)
{
if (!input.IsVector())
{
throw new MatrixError(
"Can only take the vector length of a vector.");
}
Double[] v = input.ToPackedArray();
double rtn = 0.0;
for (int i = 0; i < v.Length; i++)
{
rtn += Math.Pow(v[i], 2);
}
return Math.Sqrt(rtn);
}
/// <summary>
/// Compute the dot product for two matrixes. Note: both matrixes must be vectors.
/// </summary>
/// <param name="a">The first matrix, must be a vector.</param>
/// <param name="b">The second matrix, must be a vector.</param>
/// <returns>The dot product of the two matrixes.</returns>
public static double DotProduct(Matrix a, Matrix b)
{
if (!a.IsVector() || !b.IsVector())
{
throw new MatrixError(
"To take the dot product, both matrixes must be vectors.");
}
Double[] aArray = a.ToPackedArray();
Double[] bArray = b.ToPackedArray();
if (aArray.Length != bArray.Length)
{
throw new MatrixError(
"To take the dot product, both matrixes must be of the same length.");
}
double result = 0;
int length = aArray.Length;
for (int i = 0; i < length; i++)
{
result += aArray[i]*bArray[i];
}
return result;
}