求C#矩阵相乘的例子

答案：using System;
public class MatrixMultiply
{
    public static void Main()
    {
                int[,] matrixA = new int[2, 3];
                    int[,] matrixB = new int[3, 4] { { 4, 2, 1, 7 }, { 3, 6, 1, 0 }, { 5, 3, 2, 4 } };
              int[,] matrixC = new int[2, 4];
            for (int i = 0; i < 2; i++)
        {
            for (int j = 0; j < 3; j++)
            {
                matrixA[i, j] = (i + 1) * (j + 1) + 1;
            }
        }
        
              for (int i = 0; i < 2; i++)                                      {                                                                      for (int j = 0; j < 4; j++)
            {
                             matrixC[i, j] = 0;
                             for (int k = 0; k < 3; k++)
                {
                    matrixC[i, j] += matrxA[i, k] * matrixB[k, j];   // [0，1]*[1，0]+[0，1]*[1，0]+[0，2]*[2，0]=86              }
               
            }
        }
   

        Console.WriteLine("\n********矩阵A********");
        outputMatrix(matrixA, 2, 3);

        Console.WriteLine("\n********矩阵B********");
        outputMatrix(matrixB, 3, 4);

        Console.WriteLine("\n********矩阵A X 矩阵B********");
        outputMatrix(matrxC, 2, 4);
        Console.Read();
    }


 
   
    private static void outputMatrix(int[,] matrixX, int rowCount, int columnCount)
    {

        if (matrixX.Length != rowCount * columnCount)
        {
            Console.WriteLine("行列数错误!");
            return;
        }

        for (int i = 0; i < rowCount; i++)
        {

            for (int j = 0; j < columnCount; j++)
            {
                Console.Write(matrixX[i, j] + "\t");
            }

            Console.WriteLine();
        }
       
    }
   
}
using System;

public class MatrixMultiply

{

 public static void Main()

 { 

  int a,b,c,d;

  Console.WriteLine ("该程序将求出两个矩阵的积:");

  Console.WriteLine ("请指定矩阵A的行数:");

  a=int.Parse (Console.ReadLine ());

  Console.WriteLine ("请指定矩阵A的列数:");

  b=int.Parse (Console.ReadLine ());

  int[,] MatrixA=new int [a,b];

  for(int i=0;i<a;i++)

  {

   for(int j=0;j<b;j++)

   {

    Console.WriteLine ("请输入矩阵A第{0}行第{1}列的值:",i+1,j+1);

    MatrixA[i,j]=int.Parse (Console.ReadLine ());

   }

  }

  Console.WriteLine ("矩阵A输入完毕.");

  Console.WriteLine ("请指定矩阵B的行数:");

  c=int.Parse (Console.ReadLine ());

  Console.WriteLine ("请指定矩阵B的列数:");

  d=int.Parse (Console.ReadLine ());

  int[,] MatrixB=new int [c,d];

  for(int i=0;i<c;i++)

  {

   for(int j=0;j<d;j++)

   {

    Console.WriteLine ("请输入矩阵A第{0}行第{1}列的值:",i+1,j+1);

    MatrixB[i,j]=int.Parse (Console.ReadLine ());

   }

  }

  Console.WriteLine ("矩阵B输入完毕.");

  Console.WriteLine ("矩阵A为:");

  outputMatrix(MatrixA,a,b);

  Console.WriteLine ("矩阵B为:");

  outputMatrix(MatrixB,c,d);

  if(b!=c)

  {

   Console.WriteLine ("矩阵A的列数与矩阵B的行数不相等,无法进行乘积运算!");

   return;

  }

  else

  {

   Console.WriteLine ("矩阵A与矩阵B的乘积为:");

  }

  int[,] MatrixC=new int [a,d];

  for(int i = 0; i < a; i++)

  {

   for(int j = 0; j < d; j++)

   {

    MatrixC[i,j] = 0;

    for(int k = 0; k < b; k++)

    {

     MatrixC[i,j] += MatrixA[i,k] * MatrixB[k,j];

    }

   }

  }

  outputMatrix(MatrixC,a,d);

 }

 private static void outputMatrix(int[,] MatrixX, int rowCount, int columnCount)

 {

  for(int i = 0; i < rowCount; i++)

  { 

   for(int j = 0; j < columnCount; j++)

   {

    Console.Write(MatrixX[i,j] + "\t");

   }

   Console.WriteLine();

  }

 }

}


。。有什么不懂的可以问我。。嘿嘿。

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