Question

求C#矩阵相乘的例子

Answer 1

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。

Answer 2

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();
}

}

}