I have a fixed sized matrix whose size and elements are known at compile time. Is it possible to declare and initialize a const Eigen::Matrix? I'm looking for something like:

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  const Eigen::Matrix<float, 2, 2> A = {1.0, 2.0, 3.0, 4.0}


When I do this, I get errors like:

Matrix.h:261:7: error: static assertion failed: THIS_METHOD_IS_ONLY_FOR_VECTORS_OF_A_SPECIFIC_SIZE

I'm using this in an embedded (arm cortex-m3, bare metal) environment and want to make sure that there is zero runtime cost associated with initializing the Eigen::Matrix. Is this possible?

Hi hazelnusse,

try using

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const Eigen::Matrix<float, 2, 2> A = (Eigen::Matrix<float, 2, 2>() << 1.0f, 2.0f, 3.0f, 4.0f).finished()

Regards,
Hauke