Hi,

I'd like to communicate Eigen arrays using MPI. What I do using Blitz++ arrays is the following:

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blitz::Array<int, 2> myArray(E, 2);
// broadcasting
MPI_Bcast(myArray.data(), myArray.size(), MPI::INT, 0, MPI::COMM_WORLD);


where

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myArray.data()

returns a pointer to the element whose indices are equal to the array base

(quote from Blitz++ website).

Is there a similar way of doing this in Eigen?

Thanks a lot!

you can do the very same with .data() to get a pointer, and .size() to get the number of elements.