float sum1=0,sum2=0,sum3=0,sum4=0; for (i=0;i<len;)
float sum1 = 0; float sum2 = 0; float sum3 = 0; float sum4 = 0; for (i = 0; i < len;)
  protected static float inner_prod(float[] x, int xs, float[] y, int ys, int len)  {    int i;    float sum1=0,sum2=0,sum3=0,sum4=0;    for (i=0;i<len;)    {      sum1 += x[xs+i]*y[ys+i];      sum2 += x[xs+i+1]*y[ys+i+1];      sum3 += x[xs+i+2]*y[ys+i+2];      sum4 += x[xs+i+3]*y[ys+i+3];      i+=4;    }    return sum1+sum2+sum3+sum4;  }