Hi,

I'm wondering why the following expression doesn't work for eigen:

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MatrixXd A(10,10);
A.setRandom(10,10); // put some data inside

A.diagonal().setZero(10);


while in the examples is possible to compute the sum simply as

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A.diagonal().sum();


I would like to set the diagonal elements of a matrix to zero, is it possible via Eigen API without an explicit loop?

The following variant works:

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A.diagonal().setZero();

Your code, in which the size is specified, is not accepted because one cannot resize A.diagonal() . This is perhaps rather inconsistent in that we do allow "Vector3d v; v.setZero(3);" even though v is fixed size.