[Trilinos-Users] Constructing a CrsMatrix with just a row map

[Christopher Thiele]

Hello,

I want to construct a Tpetra::CrsMatrix, but I do not know the number of
non-zeros in advance. According to the Tpetra introduction (
https://trilinos.org/docs/r12.2/packages/tpetra/doc/html/Tpetra_Lesson04.html)
it should be possible to construct one with just a row map. However, when I
try to do it as in the example, I get a compilation error, because there
seems to be no constructor for this. The only constructor for CrsMatrix
that takes only one argument wants a CrsGraph instead of a Map. I am using
Trilinos 12.2.2.1, i.e. the same version as in the introduction.

Is there another way to create an "empty" matrix?

I appreciate any suggestions.

Regards,
Christopher
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