Dear all, I have a question about how to use the ksp in a smart way to solve a linear system. I had a simple test to generate a random matrix and vector, but I put only one nonzero value in a row (let's say 1), and in the respect location of the RHS vector I put a zero. The size of the matrix is kind of big, I saw petsc some time give unreasonable value at that loaction (it should be zero or some really small number). I want to know if there is a way to avoid it?
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