public static Matrix operator -(Matrix A, Matrix B)
{
if (A.n != B.n || A.m != B.m)
{
var e = new InvalidMatrixOperationException(A, B, $"Matrix must have equal number of columns and raws." +
$"A({A.n}, {A.m}), B({B.n},{B.m})");
throw e;
}
Matrix C = A.Clone() as Matrix;
for (int i = 0; i < C.n; i++)
{
for (int j = 0; j < C.m; j++)
{
C.Elem[i][j] -= B.Elem[i][j];
}
}
return(C);
}
public static Matrix operator *(Matrix A, Matrix B)
{
if (A.m != B.n)
{
var e = new InvalidMatrixOperationException($"{A.m} (columns of A) differs from {B.n} (raws of B) when they must be equal");
throw e;
}
Matrix C = new Matrix(A.n, B.m, CreationType.Empty);
double temp = 0;
for (int i = 0; i < A.n; i++)
{
for (int j = 0; j < B.m; j++)
{
for (int k = 0; k < B.n; k++)
{
temp += A.Elem[i][k] * B.Elem[k][j];
}
C.Elem[i][j] = temp;
temp = 0;
}
}
return(C);
}
