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double matrixdet(Matrix *a)
{
    int i,j,k;
    double t,det=1,x;
    if (a->cols!=a->rows)
    {
        printf("\n\n\t¤¹¤ß¤Þ¤»¤ó¡¢ÈëÁ¦¤¬Õý·½ÐÐÁФǤϤʤ¤¤Î¤Ç¡¢égß`¤Ã¤Æ¤¤¤Þ¤¹£¡£¡\n");
        printf("\tEnter¥­©`¤ò´ò¤Ã¤Æ¥×¥í¥°¥é¥à¤ò½KÁˤ·¤Æ¤¯¤À¤µ¤¤¡£\n");
        getch();
        return -1;
    }
    else
    {
        for (i=0;i<a->rows;i++)
            for (k=0;k<a->rows;k++)
            {
                if (k!=i)
                {
                    if (a->m[i][i]!=0)
                    {
                        t = a->m[k][i]/a->m[i][i];
                        for (j=0;j<(2*a->rows);j++)
                        {
                            x = a->m[i][j]*t;
                            a->m[k][j] = a->m[k][j] - x;
                        }
                    }
                    else
                        return 0;
                }
            }
            for (i=0;i<a->rows;i++)
                det = det*a->m[i][i];
            return (det);
    }
}
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2013-01-09 13:45
kashiwa_song
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2013-01-11 09:40
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