Confused with pdpotrf arguments

Question

I want to do a Cholesky factorization in a distributed environment. For that purpose, I use pdpotrf(). However, I am struggling understanding the parameters needed by the fu

Answer 1

From this answer, we have:

IA and JA: those parameters are meant to provide the starting row and column of your global matrix inside a larger matrix. They are only relevant if you have a big matrix and only want the Cholesky decomp of a submatrix. In your case, IA and JA both have to be 1!

Again, from this answer, there exists a link, that describes desca: