Evan Um <[email protected]> writes: > Dear Jed, > > Thanks for your help many times. These numbers mean the total number of > elements to be added using MatSetValues(). For example, at process 0, > 148767+5821 elements are added to matrix B. In other words, the length of > arrays (i.e. mat_b_i_partitioned, mat_b_j_partitioned and > mat_b_val_partitioned) > is 148767+5821. I used "ADD_VALUES" but "INSERT_VALUES" should be the same > for my work. > > As you suggested, I explicitly passed the number of local rows to > MatSetSizes as shown below. The number of local rows agrees with a range of > continuous row indices stored at array mat_b_i_partitioned. I also > explicitly set up the number of local column=the matrix size. In this case, > I get error message: "Sum of local lengths 156315 does not equal global > length 52105, my local length 52105". I used 3 processes. I guess > that number 156315 seems to be related with 3*size of my global column > size. In my problem, the matrix is partitioned by rows but not by columns.
Column ownership there refers to the distributiov of a vector that your matrix can be multiplied with, not with the ownership of entries (that is row-based for all of these formats, though others like MATELEMENTAL use totally different distributions for the entries). Since you have a square matrix, you probably want MatSetSizes(B, partitioned_row_size, partitioned_row_size, ngedges_internal, ngedges_internal);
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