Jed Brown committed fcea82f

Mat ex16: permissive option for approximate preallocation

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   printf("Dnnz %d %d\n",Dnnz,Onnz);
   ierr = MatSeqAIJSetPreallocation(Asp,Dnnz,NULL);CHKERRQ(ierr);
   ierr = MatMPIAIJSetPreallocation(Asp,Dnnz,NULL,Onnz,NULL);CHKERRQ(ierr);
+  /* The allocation above is approximate so we must set this option to be permissive.
+   * Real code should preallocate exactly. */
   /* Check zero rows */
   ierr  = MatGetOwnershipRange(A,&rstart,&rend);CHKERRQ(ierr);
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