محاسبه دترمینان ماتریس در سی

[yasinmh]

سلام
یه تابع ساده برای
دترمینان یه ماتریس مثلآ ماتریس 10 در 10 رو کسی میتونه بهم کمک کنه ؟

[nazaninn]

در C++‎ می تونم کمکت کنم

[bahram_222222]

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#include <stdlib.h> #include <alloc.h> #include <stdio.h>   int detmat ( int *arr, int order );   void main( ) {     int *arr, sum, n, i, j, pos, num ;       printf ( "\nEnter value of n for ( n x n ) matrix " ) ;     scanf ( "%d", &n ) ;     /* allocate memory to accomodate the determinant */     arr = calloc (n * n,2) ;       printf ( "\nEnter numbers :\n" ) ;     for ( i = 0 ; i < n ; i++ )     {         for ( j = 0 ; j < n ; j++ )         {             scanf ( "%d", &num ) ;             pos = i * n + j ;             arr[pos] = num ;         }     }       sum = detmat ( arr, n ) ;     free ( arr ) ;       printf ( "\n%d", sum ) ; }   int detmat ( int *arr, int order ) {     int sign = 1, sum = 0, i, j, k, count, *arr2 ;     int newsize, newpos, pos ;       if ( order == 1 )          return ( arr[0] ) ;       for ( i = 0 ; i < order ; i++, sign *= -1 )     {         /* copy n-1 by n-1 array into another array */         newsize = ( order - 1 ) * ( order - 1 ) ;         arr2 = calloc (newsize,2) ;         for ( j = 1 ; j < order ; j++ )         {             for ( k = 0, count = 0 ; k < order ; k++ )             {                 if ( k == i )                      continue ;                   pos = j * order + k ;                 newpos = ( j - 1 ) * ( order - 1 ) + count ;                   arr2[newpos] = arr[pos] ;                 count++ ;             }          }            /*  find determinant value of n-1 by n-1 array and  add it to sum */          sum = sum + arr[i] * sign * detmat ( arr2, order - 1 ) ;          free ( arr2 ) ;     }     return ( sum ) ; }

[powerboy2988]

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#include <stdio.h> #include <conio.h> #include <math.h>   #define N 4 #define FALSE 0   void main(void) {  long determination(int [N][N],int,int); int array_1[N][N],i,j; clrscr();  for(i=0;i<N;i++)    for(j=0;j<N;i++)         {           printf("enter A[%u][%u]:\0",i,j)           scanf("%d",&array_1[i][j]);     }  printf("determination of A is =%d\n\0",detemination(array_1,N,N)); }    long determination(int [N][N],int,int)  {   int i,j,ii,jj,i_i,j_j;   int tar[N][N],a1,a2,a3,a4;   long s=0;   if(m!==n)    return 0;   if(m==2)   {    a1=*(*(ar+0)+0);    a4=*(*(ar+1)+1);    a2=*(*(ar+0)+1);    a3=*(*(ar+1)+0);    retrun(a1*a4-a2*a3)   }  else   {     for(i=0;i<m;i++)      for(j=0;j<n;j++)        tar[i][j]=*(*(ar+i)+j)      for(j=0;j<n;j++)        {          i_i=j_j=0;          for(ii=1;ii<m;ii++)       {             for(jj=1;jj<n;jj++)         if(jj!==j)           {         *(*(ar+i_i)+j_j=tar[ii][jj];         j_j++;           }          i_i++;          j_j=0;            }          s+=((j+1)%2==0)?-1:+1)*tar[0][j]*determination(ar,m-1,n-1);     }  retrun(s)   }              }

[amirtoty]

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#include <stdio.h> #include <conio.h> #include <math.h>   #define N 4 #define FALSE 0   void main(void) {  long determination(int [N][N],int,int); int array_1[N][N],i,j; clrscr();  for(i=0;i<N;i++)    for(j=0;j<N;i++)         {           printf("enter A[%u][%u]:\0",i,j)           scanf("%d",&array_1[i][j]);     }  printf("determination of A is =%d\n\0",detemination(array_1,N,N)); }    long determination(int [N][N],int,int)  {   int i,j,ii,jj,i_i,j_j;   int tar[N][N],a1,a2,a3,a4;   long s=0;   if(m!==n)    return 0;   if(m==2)   {    a1=*(*(ar+0)+0);    a4=*(*(ar+1)+1);    a2=*(*(ar+0)+1);    a3=*(*(ar+1)+0);    retrun(a1*a4-a2*a3)   }  else   {     for(i=0;i<m;i++)      for(j=0;j<n;j++)        tar[i][j]=*(*(ar+i)+j)      for(j=0;j<n;j++)        {          i_i=j_j=0;          for(ii=1;ii<m;ii++)       {             for(jj=1;jj<n;jj++)         if(jj!==j)           {         *(*(ar+i_i)+j_j=tar[ii][jj];         j_j++;           }          i_i++;          j_j=0;            }          s+=((j+1)%2==0)?-1:+1)*tar[0][j]*determination(ar,m-1,n-1);     }  retrun(s)   }              }

توی قسمت تابع چرا هیچ اسمی برای متغیرهاش در نظر نگرفتی؟؟
اصلا ar کجا معرفی شده که داره ازش استفاده میشه؟؟