[petsc-users] On the usage of MatSetValuesBlocked

[Edoardo alinovi]

Ah, I was forgetting the most important thing... Are the size of idxm and
idxn equal to one if I insert 1 block or should I specify all the rows and
columns in the block?

I am getting some memory issues with unallocated non zero values so I must
have made some mistake here... :(

Sorry for the ton of questions!
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