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void
matrixMM4 (float* left, float* right)
{
  float* tmp = (float*) malloc (sizeof(float) * 16);
  memset (tmp, 0, sizeof(float) * 16);
  typedef float (*DyadicArray)[4];    //¶þάÊý×éÀàÐͶ¨Òå
  DyadicArray dLeft = (DyadicArray) left;    //ÕâÑùǿתºó,¶ÔÊÍ·ÅÊÇ·ñÓÐÓ°Ïì.
  DyadicArray dRight = (DyadicArray) right;
  DyadicArray dTmp = (DyadicArray) tmp;
  int i, j, len;
  for (i = 0; i < 4; ++i)
    {
      for (j = 0; j < 4; ++j)
    {
      float t;
      t = 0.0f;//<--µ±Î´¸³Óè³õʼֵ0,½á¹ûÂÒÆß°ËÔã,¼«ÆäÖØÒª-->
      for (len = 0; len < 4; ++len)
        {
          t += (dLeft[i][len] * dRight[len][j]);
        }
      dTmp[i][j] = t;
    }
    }
  memcpy (left, dTmp, 16 * sizeof(float));
  free (tmp);
}