static char help[] = "Tests the various sequential routines in MatSBAIJ format. Same as ex74.c except diagonal entries of the matrices are zeros.\n";

#include "petscmat.h"

#undef __FUNCT__
#define __FUNCT__ "main"
int main(int argc,char **args)
{
  Vec            x,y,b,s1,s2;      
  Mat            A;           /* linear system matrix */ 
  Mat            sA;         /* symmetric part of the matrices */ 
  PetscInt       n,mbs=16,bs=1,nz=3,prob=2,i,j,col[3],row,Ii,J,n1,*ip_ptr;
  PetscScalar    neg_one = -1.0,value[3],alpha=0.1;
  PetscMPIInt    size;
  PetscErrorCode ierr;
  IS             ip, isrow, iscol;
  PetscRandom    rdm;
  PetscTruth     reorder=PETSC_FALSE;
  MatInfo        minfo1,minfo2;
  PetscReal      norm1,norm2,tol=1.e-10;

  PetscInitialize(&argc,&args,(char *)0,help);
  ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr);
  if (size != 1) SETERRQ(1,"This is a uniprocessor example only!");
  ierr = PetscOptionsGetInt(PETSC_NULL,"-bs",&bs,PETSC_NULL);CHKERRQ(ierr);
  ierr = PetscOptionsGetInt(PETSC_NULL,"-mbs",&mbs,PETSC_NULL);CHKERRQ(ierr);

  n = mbs*bs;
  ierr=MatCreateSeqBAIJ(PETSC_COMM_WORLD,bs,n,n,nz,PETSC_NULL, &A);CHKERRQ(ierr);
  ierr=MatCreateSeqSBAIJ(PETSC_COMM_WORLD,bs,n,n,nz,PETSC_NULL, &sA);CHKERRQ(ierr);

  /* Test MatGetOwnershipRange() */
  ierr = MatGetOwnershipRange(A,&Ii,&J);CHKERRQ(ierr);
  ierr = MatGetOwnershipRange(sA,&i,&j);CHKERRQ(ierr);
  if (i-Ii || j-J){
    ierr = PetscPrintf(PETSC_COMM_SELF,"Error: MatGetOwnershipRange() in MatSBAIJ format\n");CHKERRQ(ierr);
  }

  /* Assemble matrix */
  if (bs == 1){
    ierr = PetscOptionsGetInt(PETSC_NULL,"-test_problem",&prob,PETSC_NULL);CHKERRQ(ierr);
    if (prob == 1){ /* tridiagonal matrix */
      value[0] = -1.0; value[1] = 2.0; value[2] = -1.0;
      for (i=1; i<n-1; i++) {
        col[0] = i-1; col[1] = i; col[2] = i+1;
        ierr = MatSetValues(A,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr);
        ierr = MatSetValues(sA,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr);
      }
      i = n - 1; col[0]=0; col[1] = n - 2; col[2] = n - 1;
      value[0]= 0.1; value[1]=-1; value[2]=2;
      ierr = MatSetValues(A,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr);
      ierr = MatSetValues(sA,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr);

      i = 0; col[0] = 0; col[1] = 1; col[2]=n-1;
      value[0] = 2.0; value[1] = -1.0; value[2]=0.1;
      ierr = MatSetValues(A,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr);
      ierr = MatSetValues(sA,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr);
    }
    else if (prob ==2){ /* matrix for the five point stencil */
      n1 = (int) (sqrt((PetscReal)n) + 0.001); 
      if (n1*n1 - n) SETERRQ(PETSC_ERR_ARG_WRONG,"sqrt(n) must be a positive interger!"); 
      for (i=0; i<n1; i++) {
        for (j=0; j<n1; j++) {
          Ii = j + n1*i;
          if (i>0)   {
            J = Ii - n1; 
            ierr = MatSetValues(A,1,&Ii,1,&J,&neg_one,INSERT_VALUES);CHKERRQ(ierr); 
            ierr = MatSetValues(sA,1,&Ii,1,&J,&neg_one,INSERT_VALUES);CHKERRQ(ierr);
          }
          if (i<n1-1) {
            J = Ii + n1; 
            ierr = MatSetValues(A,1,&Ii,1,&J,&neg_one,INSERT_VALUES);CHKERRQ(ierr);
            ierr = MatSetValues(sA,1,&Ii,1,&J,&neg_one,INSERT_VALUES);CHKERRQ(ierr);
          }
          if (j>0)   {
            J = Ii - 1; 
            ierr = MatSetValues(A,1,&Ii,1,&J,&neg_one,INSERT_VALUES);CHKERRQ(ierr);
            ierr = MatSetValues(sA,1,&Ii,1,&J,&neg_one,INSERT_VALUES);CHKERRQ(ierr);
          }
          if (j<n1-1) {
            J = Ii + 1; 
            ierr = MatSetValues(A,1,&Ii,1,&J,&neg_one,INSERT_VALUES);CHKERRQ(ierr);
            ierr = MatSetValues(sA,1,&Ii,1,&J,&neg_one,INSERT_VALUES);CHKERRQ(ierr);
          }
          /*
          ierr = MatSetValues(A,1,&I,1,&I,&four,INSERT_VALUES);CHKERRQ(ierr);
          ierr = MatSetValues(sA,1,&I,1,&I,&four,INSERT_VALUES);CHKERRQ(ierr);
          */
        }
      }                   
    }
  } 
  else { /* bs > 1 */
#ifdef DIAGB
    for (block=0; block<n/bs; block++){
      /* diagonal blocks */
      value[0] = -1.0; value[1] = 4.0; value[2] = -1.0;
      for (i=1+block*bs; i<bs-1+block*bs; i++) {
        col[0] = i-1; col[1] = i; col[2] = i+1;
        ierr = MatSetValues(A,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr);
        ierr = MatSetValues(sA,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr);    
      }
      i = bs - 1+block*bs; col[0] = bs - 2+block*bs; col[1] = bs - 1+block*bs;
      value[0]=-1.0; value[1]=4.0;  
      ierr = MatSetValues(A,1,&i,2,col,value,INSERT_VALUES);CHKERRQ(ierr);
      ierr = MatSetValues(sA,1,&i,2,col,value,INSERT_VALUES);CHKERRQ(ierr); 

      i = 0+block*bs; col[0] = 0+block*bs; col[1] = 1+block*bs; 
      value[0]=4.0; value[1] = -1.0; 
      ierr = MatSetValues(A,1,&i,2,col,value,INSERT_VALUES);CHKERRQ(ierr);
      ierr = MatSetValues(sA,1,&i,2,col,value,INSERT_VALUES);CHKERRQ(ierr);  
    }
#endif
    /* off-diagonal blocks */
    value[0]=-1.0;
    for (i=0; i<(n/bs-1)*bs; i++){
      col[0]=i+bs;
      ierr = MatSetValues(A,1,&i,1,col,value,INSERT_VALUES);CHKERRQ(ierr);
      ierr = MatSetValues(sA,1,&i,1,col,value,INSERT_VALUES);CHKERRQ(ierr);
      col[0]=i; row=i+bs;
      ierr = MatSetValues(A,1,&row,1,col,value,INSERT_VALUES);CHKERRQ(ierr);
      ierr = MatSetValues(sA,1,&row,1,col,value,INSERT_VALUES);CHKERRQ(ierr);
    }
  }
  ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  /* PetscPrintf(PETSC_COMM_SELF,"\n The Matrix: \n");
  MatView(A, VIEWER_DRAW_WORLD);
  MatView(A, VIEWER_STDOUT_WORLD); */ 

  ierr = MatAssemblyBegin(sA,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(sA,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);  
  /* PetscPrintf(PETSC_COMM_SELF,"\n Symmetric Part of Matrix: \n");
  MatView(sA, VIEWER_DRAW_WORLD); 
  MatView(sA, VIEWER_STDOUT_WORLD); 
  */

  /* Test MatNorm() */
  ierr = MatNorm(A,NORM_FROBENIUS,&norm1);CHKERRQ(ierr); 
  ierr = MatNorm(sA,NORM_FROBENIUS,&norm2);CHKERRQ(ierr);
  norm1 -= norm2;
  if (norm1<-tol || norm1>tol){ 
    ierr = PetscPrintf(PETSC_COMM_SELF,"Error: MatNorm(), fnorm1-fnorm2=%16.14e\n",norm1);CHKERRQ(ierr);
  }
  ierr = MatNorm(A,NORM_INFINITY,&norm1);CHKERRQ(ierr);
  ierr = MatNorm(sA,NORM_INFINITY,&norm2);CHKERRQ(ierr);
  norm1 -= norm2;
  if (norm1<-tol || norm1>tol){ 
    ierr = PetscPrintf(PETSC_COMM_SELF,"Error: MatNorm(), inf_norm1-inf_norm2=%16.14e\n",norm1);CHKERRQ(ierr);
  }
  
  /* Test MatGetInfo(), MatGetSize(), MatGetBlockSize() */
  ierr = MatGetInfo(A,MAT_LOCAL,&minfo1);CHKERRQ(ierr);
  ierr = MatGetInfo(sA,MAT_LOCAL,&minfo2);CHKERRQ(ierr);
  /*
  printf("matrix nonzeros (BAIJ format) = %d, allocated nonzeros= %d\n", (int)minfo1.nz_used,(int)minfo1.nz_allocated); 
  printf("matrix nonzeros(SBAIJ format) = %d, allocated nonzeros= %d\n", (int)minfo2.nz_used,(int)minfo2.nz_allocated); 
  */
  i = (int) (minfo1.nz_used - minfo2.nz_used); 
  j = (int) (minfo1.nz_allocated - minfo2.nz_allocated);
  if (i<0 || j<0) {
    ierr = PetscPrintf(PETSC_COMM_SELF,"Error: MatGetInfo()\n");CHKERRQ(ierr);
  }

  ierr = MatGetSize(A,&Ii,&J);CHKERRQ(ierr);
  ierr = MatGetSize(sA,&i,&j);CHKERRQ(ierr); 
  if (i-Ii || j-J) {
    PetscPrintf(PETSC_COMM_SELF,"Error: MatGetSize()\n");CHKERRQ(ierr);
  }
 
  ierr = MatGetBlockSize(A, &Ii);CHKERRQ(ierr);
  ierr = MatGetBlockSize(sA, &i);CHKERRQ(ierr);
  if (i-Ii){
    ierr = PetscPrintf(PETSC_COMM_SELF,"Error: MatGetBlockSize()\n");CHKERRQ(ierr);
  }

  /* Test MatDiagonalScale(), MatGetDiagonal(), MatScale() */
  ierr = PetscRandomCreate(PETSC_COMM_SELF,&rdm);CHKERRQ(ierr);
  ierr = PetscRandomSetFromOptions(rdm);CHKERRQ(ierr);
  ierr = VecCreateSeq(PETSC_COMM_SELF,n,&x);CHKERRQ(ierr);     
  ierr = VecDuplicate(x,&s1);CHKERRQ(ierr);
  ierr = VecDuplicate(x,&s2);CHKERRQ(ierr);
  ierr = VecDuplicate(x,&y);CHKERRQ(ierr);
  ierr = VecDuplicate(x,&b);CHKERRQ(ierr);

  ierr = VecSetRandom(x,rdm);CHKERRQ(ierr);

  ierr = MatDiagonalScale(A,x,x);CHKERRQ(ierr);
  ierr = MatDiagonalScale(sA,x,x);CHKERRQ(ierr);

  ierr = MatGetDiagonal(A,s1);CHKERRQ(ierr);  
  ierr = MatGetDiagonal(sA,s2);CHKERRQ(ierr);
  ierr = VecNorm(s1,NORM_1,&norm1);CHKERRQ(ierr);
  ierr = VecNorm(s2,NORM_1,&norm2);CHKERRQ(ierr);
  norm1 -= norm2;
  if (norm1<-tol || norm1>tol) { 
    ierr = PetscPrintf(PETSC_COMM_SELF,"Error:MatGetDiagonal() \n");CHKERRQ(ierr);
  } 

  ierr = MatScale(A,alpha);CHKERRQ(ierr);
  ierr = MatScale(sA,alpha);CHKERRQ(ierr);

  /* Test MatMult(), MatMultAdd() */
  for (i=0; i<40; i++) { 
    ierr = VecSetRandom(x,rdm);CHKERRQ(ierr);
    ierr = MatMult(A,x,s1);CHKERRQ(ierr);
    ierr = MatMult(sA,x,s2);CHKERRQ(ierr);
    ierr = VecNorm(s1,NORM_1,&norm1);CHKERRQ(ierr);
    ierr = VecNorm(s2,NORM_1,&norm2);CHKERRQ(ierr);
    norm1 -= norm2;
    if (norm1<-tol || norm1>tol) { 
      ierr = PetscPrintf(PETSC_COMM_SELF,"Error: MatMult(), MatDiagonalScale() or MatScale()\n");CHKERRQ(ierr);
    }
  }  

  for (i=0; i<40; i++) {
    ierr = VecSetRandom(x,rdm);CHKERRQ(ierr);
    ierr = VecSetRandom(y,rdm);CHKERRQ(ierr);
    ierr = MatMultAdd(A,x,y,s1);CHKERRQ(ierr);
    ierr = MatMultAdd(sA,x,y,s2);CHKERRQ(ierr);
    ierr = VecNorm(s1,NORM_1,&norm1);CHKERRQ(ierr);
    ierr = VecNorm(s2,NORM_1,&norm2);CHKERRQ(ierr);
    norm1 -= norm2;
    if (norm1<-tol || norm1>tol) { 
      ierr = PetscPrintf(PETSC_COMM_SELF,"Error:MatMultAdd(), MatDiagonalScale() or MatScale() \n");CHKERRQ(ierr);
    } 
  }

  /* Test MatReordering() */
  ierr = MatGetOrdering(A,MATORDERING_NATURAL,&isrow,&iscol);CHKERRQ(ierr); 
  ip = isrow;

  if (reorder){
    ierr = ISGetIndices(ip,&ip_ptr);CHKERRQ(ierr);
    i = ip_ptr[1]; ip_ptr[1] = ip_ptr[mbs-2]; ip_ptr[mbs-2] = i; 
    i = ip_ptr[0]; ip_ptr[0] = ip_ptr[mbs-1]; ip_ptr[mbs-1] = i; 
    ierr= ISRestoreIndices(ip,&ip_ptr);CHKERRQ(ierr);

    ierr = MatReorderingSeqSBAIJ(sA, ip);CHKERRQ(ierr);  
    /* ierr = ISView(ip, VIEWER_STDOUT_SELF);CHKERRQ(ierr); 
       ierr = MatView(sA,VIEWER_DRAW_SELF);CHKERRQ(ierr); */
  }
  
  ierr = ISDestroy(iscol);CHKERRQ(ierr);
  /* ierr = ISDestroy(isrow);CHKERRQ(ierr);*/

  ierr = ISDestroy(isrow);CHKERRQ(ierr);
  ierr = MatDestroy(A);CHKERRQ(ierr);
  ierr = MatDestroy(sA);CHKERRQ(ierr);
  ierr = VecDestroy(x);CHKERRQ(ierr);
  ierr = VecDestroy(y);CHKERRQ(ierr);
  ierr = VecDestroy(s1);CHKERRQ(ierr);
  ierr = VecDestroy(s2);CHKERRQ(ierr);
  ierr = VecDestroy(b);CHKERRQ(ierr);
  ierr = PetscRandomDestroy(rdm);CHKERRQ(ierr);

  ierr = PetscFinalize();CHKERRQ(ierr);
  return 0;
}