矩阵的标量乘法程序-yiteyi-C++库

给定一个矩阵和一个标量元素k，我们的任务是找出该矩阵的标量积。 例如：

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Input : mat[][] = {{2, 3}                   {5, 4}}        k = 5Output : 10 15          25 20 We multiply 5 with every element.Input : 1 2 3         4 5 6        7 8 9        k = 4Output :  4 8  12          16 20 24          28 32 36

推荐：请尝试你的方法 {IDE} 首先，在进入解决方案之前。

这个 标量乘法 对于一个数k（标量），在矩阵中的每个条目上相乘。矩阵a就是矩阵kA。

C++

                         // C++ program to find the scalar product                       
                         // of a matrix                       
                         #include <bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
           
                         // Size of given matrix                       
                         #define N 3                       
           
                         void                                     scalarProductMat(                                     int                                     mat[][N],                                     int                                     k)                       
                         {                       
                                                 // scalar element is multiplied by the matrix                       
                                                 for                                     (                                     int                                     i = 0; i < N; i++)                       
                                                 for                                     (                                     int                                     j = 0; j < N; j++)                       
                                                 mat[i][j] = mat[i][j] * k;                       
                         }                       
           
                         // Driver code                       
                         int                                     main()                       
                         {                       
                                                 int                                     mat[N][N] = { { 1, 2, 3 },                       
                                                 { 4, 5, 6 },                       
                                                 { 7, 8, 9 } };                       
                                                 int                                     k = 4;                       
           
                                                 scalarProductMat(mat, k);                       
           
                                                 // to display the resultant matrix                       
                                                 printf                                     (                                     "Scalar Product Matrix is : "                                     );                       
                                                 for                                     (                                     int                                     i = 0; i < N; i++) {                       
                                                 for                                     (                                     int                                     j = 0; j < N; j++)                       
                                                 printf                                     (                                     "%d "                                     , mat[i][j]);                       
                                                 printf                                     (                                     ""                                     );                       
                                                 }                       
           
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java program to find                       
                         // the scalar product                       
                         // of a matrix                       
                         import                                     java.io.*;                       
           
                         class                                     GFG {                       
                                   
                         static                                     final                                     int                                     N =                                     3                                     ;                       
                         static                                     void                                     scalarProductMat(                                     int                                     mat[][],                       
                                                 int                                     k)                       
                         {                       
                                   
                                                 // scalar element is multiplied                       
                                                 // by the matrix                       
                                                 for                                     (                                     int                                     i =                                     0                                     ; i < N; i++)                       
                                                 for                                     (                                     int                                     j =                                     0                                     ; j < N; j++)                       
                                                 mat[i][j] = mat[i][j] * k;                       
                         }                       
           
                         // Driver code                       
                         public                                     static                                     void                                     main (String[] args)                       
                         {                       
                                                 int                                     mat[][] = { {                                     1                                     ,                                     2                                     ,                                     3                                     },                       
                                                 {                                     4                                     ,                                     5                                     ,                                     6                                     },                       
                                                 {                                     7                                     ,                                     8                                     ,                                     9                                     } };                       
                                                 int                                     k =                                     4                                     ;                       
           
                                                 scalarProductMat(mat, k);                       
           
                                                 // to display the resultant matrix                       
                                                 System.out.println(                                     "Scalar Product Matrix is : "                                     );                       
                                   
                                                 for                                     (                                     int                                     i =                                     0                                     ; i < N; i++)                       
                                                 {                       
                                                 for                                     (                                     int                                     j =                                     0                                     ; j < N; j++)                       
                                                 System.out.print(mat[i][j] +                                     " "                                     );                       
                                                 System.out.println();                       
                                                 }                       
                         }                       
                         }                       
           
                         // This code is contributed by Ajit.                       

Python 3

                         # Python 3 program to find the scalar                       
                         # product of a matrix                       
           
                         # Size of given matrix                       
                         N                                     =                                     3                       
           
                         def                                     scalarProductMat( mat, k):                       
           
                                                 # scalar element is multiplied                       
                                                 # by the matrix                       
                                                 for                                     i                                     in                                     range                                     ( N):                       
                                                 for                                     j                                     in                                     range                                     ( N):                       
                                                 mat[i][j]                                     =                                     mat[i][j]                                     *                                     k                       
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     "__main__"                                     :                       
                                   
                                                 mat                                     =                                     [[                                     1                                     ,                                     2                                     ,                                     3                                     ],                       
                                                 [                                     4                                     ,                                     5                                     ,                                     6                                     ],                       
                                                 [                                     7                                     ,                                     8                                     ,                                     9                                     ]]                       
                                                 k                                     =                                     4                       
           
                                                 scalarProductMat(mat, k)                       
           
                                                 # to display the resultant matrix                       
                                                 print                                     (                                     "Scalar Product Matrix is : "                                     )                       
                                                 for                                     i                                     in                                     range                                     (N):                       
                                                 for                                     j                                     in                                     range                                     (N):                       
                                                 print                                     (mat[i][j], end                                     =                                     " "                                     )                       
                                                 print                                     ()                       
           
                         # This code is contributed by ita_c                       

C#

                         // C# program to find                       
                         // the scalar product                       
                         // of a matrix                       
                         using                                     System;                       
           
                         class                                     GFG{                       
           
                         static                                     int                                     N = 3;                       
                         static                                     void                                     scalarProductMat(                                     int                                     [,] mat,                       
                                                 int                                     k)                       
                         {                       
                                   
                                                 // scalar element is multiplied                       
                                                 // by the matrix                       
                                                 for                                     (                                     int                                     i = 0; i < N; i++)                       
                                                 for                                     (                                     int                                     j = 0; j < N; j++)                       
                                                 mat[i,j] = mat[i, j] * k;                       
                         }                       
           
                         // Driver code                       
                         static                                     public                                     void                                     Main ()                       
                         {                       
                                                 int                                     [,] mat = {{1, 2, 3},                       
                                                 {4, 5, 6},                       
                                                 {7, 8, 9}};                       
                                                 int                                     k = 4;                       
           
                                                 scalarProductMat(mat, k);                       
           
                                                 // to display the resultant matrix                       
                                                 Console.WriteLine(                                     "Scalar Product Matrix is : "                                     );                       
                                   
                                                 for                                     (                                     int                                     i = 0; i < N; i++) {                       
                                                 for                                     (                                     int                                     j = 0; j < N; j++)                       
                                                 Console.Write(mat[i, j] +                                     " "                                     );                       
                                                 Console.WriteLine();                       
                                                 }                       
                         }                       
                         }                       
           
                         // This code is contributed by Ajit.                       

PHP

                         <?php                       
                         // PHP program to find                       
                         // the scalar product                       
                         // of a matrix                       
           
                         function                                     scalarProductMat(                                     $mat                                     ,                       
                                                 $k                                     )                       
                         {                       
                                                 $N                                     = 3;                       
                                   
                                                 // scalar element is multiplied                       
                                                 // by the matrix                       
                                                 for                                     (                                     $i                                     = 0;                                     $i                                     <                                     $N                                     ;                                     $i                                     ++)                       
                                                 for                                     (                                     $j                                     = 0;                                     $j                                     <                                     $N                                     ;                                     $j                                     ++)                       
                                                 $mat                                     [                                     $i                                     ][                                     $j                                     ] =                                     $mat                                     [                                     $i                                     ][                                     $j                                     ] *                                     $k                                     ;                       
                                   
                                                 return                                     $mat                                     ;                       
                         }                       
           
                         // Driver code                       
                         $N                                     = 3;                       
                         $mat                                     =                                     array                                     (                                     array                                     (1, 2, 3 ),                       
                                                 array                                     ( 4, 5, 6 ),                       
                                                 array                                     (7, 8, 9 ));                       
                         $k                                     = 4;                       
           
                         $mat1                                     = scalarProductMat(                                     $mat                                     ,                                     $k                                     );                       
           
                         // to display the resultant matrix                       
                         echo                                     (                                     "Scalar Product Matrix is : "                                     .                                     ""                                     );                       
           
                         for                                     (                                     $i                                     = 0;                                     $i                                     <                                     $N                                     ;                                     $i                                     ++)                       
                         {                       
                                                 for                                     (                                     $j                                     = 0;                                     $j                                     <                                     $N                                     ;                                     $j                                     ++)                       
                                                 echo                                     (                                     $mat1                                     [                                     $i                                     ][                                     $j                                     ] .                                     " "                                     );                       
                                                 echo                                     ""                                     ;                       
                         }                       
           
                         // This code is contributed                       
                         // by Mukul Singh                       

Javascript

                         <script>                       
           
                         // Javascript program to find the scalar product                       
                         // of a matrix                       
           
                         // Size of given matrix                       
                         N = 3                       
           
                         function                                     scalarProductMat(mat, k)                       
                         {                       
           
                                                 // scalar element is multiplied by the matrix                       
                                                 for                                     (                                     var                                     i = 0; i < N; i++)                       
                                                 for                                     (                                     var                                     j = 0; j < N; j++)                       
                                                 mat[i][j] = mat[i][j] * k;                       
                         }                       
           
                         // Driver code                       
                         var                                     mat = [ [ 1, 2, 3 ],                       
                                                 [ 4, 5, 6 ],                       
                                                 [ 7, 8, 9 ] ];                       
                         var                                     k = 4;                       
                         scalarProductMat(mat, k);                       
           
                         // to display the resultant matrix                       
                         document.write(                                     "Scalar Product Matrix is : <br>"                                     );                       
                         for                                     (                                     var                                     i = 0; i < N; i++)                       
                         {                       
                                                 for                                     (                                     var                                     j = 0; j < N; j++)                       
                                                 document.write(mat[i][j]+                                     " "                                     );                       
                                                 document.write(                                     "<br>"                                     );                       
                         }                       
           
                         // This code is contributed by noob2000.                       
                         </script>                       

输出：

Scalar Product Matrix is : 4 8 12 16 20 24 28 32 36

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