MPI COMM WORLD) ag, v-a(i, v) *sinI +a(, v)"cos l MPI Send(&(buffed(m/2,0)) m/2*N, MPI FLOAT. for(v=0, V<N; V++) myid-1, myid-1 if((vl=b())&&(vl=bo) MPI COMM WORLD) MPI Send(&buf[m/2), m/2 brave(v, b()) MPI INT, myid-I myid-1 e(v, bo) MPI COMM WORLD) 陣每经过一次交换,消去相应 的非主对角元素 for(i=0;<m2;++) for(v=0; v<m, v++) for(=m/2:j<m: j++) e(v, b(]; if (a(i, b()=0) g(a(, bO)-a(ib(i))2: bilv]a(v, b(i)) hsun(g)*f/ sin2=h a(v, b(F-a(v, b() bpp=a(1,b()*cos 1*cos cos 1 for(v=0; v<m, v++) a(i, b()*sinl"sin if((vl=i)&&(vl=D) a(v, b(Fbi]: osl-a(i, bo) a(l, b(bpp a(1, bO)bpq a(, b(ibgp brlv]a(iv)°cosl templ[3](float)bo)MPI_COMM_WORLD); MPI_Send(&(buffee(m/2,0)), m/2*N,MPI_FLOAT, myid-1,myid-1, MPI_COMM_WORLD); MPI_Send(&buf[m/2],m/2, MPI_INT,myid-1, myid-1, MPI_COMM_WORLD); } } /*每经过一次交换，消去相应 的非主对角元素*/ for(i=0;i<m/2;i++) for(j=m/2;j<m;j++) { if (a(i,b(j))!=0) { f=-a(i,b(j)); g=(a(j,b(j))-a(i,b(i)))/2; h=sgn(g)*f/ sqrt(f*f+g*g); sin2=h; sin1=h/sqrt(2*(1+ sqrt(1-h*h))); cos1=sqrt(1-sin1*sin1); bpp=a(i,b(i))*cos1*cos1 +a(j,b(j))*sin1* sin1+a(i,b(j)) *sin2; bqq=a(i,b(i))*sin1*sin1 +a(j,b(j))*cos1* cos1-a(i,b(j)) *sin2; bpq=0; bqp=0; for(v=0;v<N;v++) if ((v!=b(i))&&(v!=b(j))) { br[v]=a(i,v)*cos1 +a(j,v)*sin1; a(j,v)=-a(i,v)*sin1 +a(j,v)*cos1; } for(v=0;v<N;v++) if ((v!=b(i))&&(v!=b(j))) a(i,v)=br[v]; for(v=0;v<m;v++) br[v]=e(v,b(i)) *cos1+ e(v,b(j)) *sin1; for(v=0;v<m;v++) e(v,b(j))=e(v,b(i)) *(-sin1)+ e(v,b(j)) *cos1; for(v=0;v<m;v++) e(v,b(i))=br[v]; for(v=0;v<m;v++) if ((v!=i)&&(v!=j)) { bi[v]=a(v,b(i)) *cos1+ a(v,b(j))* sin1; a(v,b(j))=-a(v,b(i)) *sin1+ a(v,b(j))* cos1; } for(v=0;v<m;v++) if ((v!=i)&&(v!=j)) a(v,b(i))=bi[v]; a(i,b(i))=bpp; a(j,b(j))=bqq; a(i,b(j))=bpq; a(j,b(i))=bqp; temp1[0]=sin1; temp1[1]=cos1; temp1[2]=(float)b(i); temp1[3]=(float)b(j); }