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Questions - eigen

`std::move` an Eigen object in a constructor?

The Eigen3 documentation warns against passing Eigen objects by value, but they only refer to objects being used as function arguments. Suppose I'm using Eigen 3.4.0 and C++20. If I have a struct with...
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NickFP

c++

eigen

eigen3

Votes: 0

Answers: 1

Latest Answer

There is nothing magic about Eigen objects. Fixed sized types such as Vector3d behave like std::array. Dynamic sized types like VectorXd behave like std::vector. Pass-by-value for a dynamic sized type...
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Homer512

Eigen static lib memory align

I am using C++17, GCC 7.4.0, Eigen 3.3.4 This is my minimal example. I have 2 classes: B and C. C is in a static library. The program crashes with Segmentation Fault when trying to create an instance ...
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AndroC

c++

c++17

eigen

Votes: 0

Answers: 1

Latest Answer

Judging from your comments at your other post, you might be using different architecture options while compiling the library and the executable (-m... flags for gcc)? At least, I could reproduce the c...
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Sedenion

Eigen rowwise multiplication of two matrices

I am trying to do a rowwise multiplication between two matrices. The dimensions are Nx3 and Nx1 and the output should be Nx3. I saw several related answers, but they are trying to do dot project, whic...
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BruceZ

c++

eigen

Votes: 0

Answers: 1

Latest Answer

Please make the n by 1 matrix as a vector as follows: int n = 5000; Eigen::MatrixXf A = MatrixXf::Random(n,3); Eigen::VectorXf B = MatrixXf::Random(n,1); Eigen::MatrixXf result =A.array().colwi...
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Didarul Ahasan Redwan

Can OpenMP's SIMD directive vectorize indexing operations?

Say I have an MxN matrix (SIG) and a list of Nx1 fractional indices (idxt). Each fractional index in idxt uniquely corresponds to the same position column in SIG. I would like to index to the appropri...
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drakon101

c++

openmp

eigen

simd

Votes: 0

Answers: 2

Latest Answer

Theoretically, it should be possible, assuming the processor support this operation. However, in practice, this is not the case for many reasons. First of all, mainstream x86-64 processors supporting ...
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Jérôme Richard

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