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Matrix multiplication: Difference between revisions
Add a C# matrix class with multiply operator
(Slight optimization) |
(Add a C# matrix class with multiply operator) |
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{ 0.00, 0.00, 1.00, -0.00},
{ 0.00, 0.00, 0.00, 1.00}};
=={{header|C sharp|C#}}==
This code should work with any version of the .NET Framework and C# language
<lang csharp>public class Matrix
{
int n;
int m;
double[,] a;
public Matrix(int n, int m)
{
if (n <= 0 || m <= 0)
throw new ArgumentException("Matrix dimensions must be positive");
this.n = n;
this.m = m;
a = new double[n, m];
}
//indices start from one
public double this[int i, int j]
{
get { return a[i - 1, j - 1]; }
set { a[i - 1, j - 1] = value; }
}
public int N { get { return n; } }
public int M { get { return m; } }
public static Matrix operator*(Matrix _a, Matrix b)
{
int n = _a.N;
int m = b.M;
int l = _a.M;
if (l != b.N)
throw new ArgumentException("Illegal matrix dimensions for multiplication. _a.M must be equal b.N");
Matrix result = new Matrix(_a.N, b.M);
for(int i = 0; i < n; i++)
for (int j = 0; j < m; j++)
{
double sum = 0.0;
for (int k = 0; k < l; k++)
sum += _a.a[i, k]*b.a[k, j];
result.a[i, j] = sum;
}
return result;
}
}</lang>
=={{header|C++}}==
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49 64
</pre>
=={{header|Clojure}}==
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