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c++ Programming Glossary: arraydMapping array back to an existing Eigen matrix http://stackoverflow.com/questions/12003692/mapping-array-back-to-an-existing-eigen-matrix way to do it back. void foo MatrixXd matrix int n double arrayd new double n n map the input matrix to an array Map MatrixXd.. double n n map the input matrix to an array Map MatrixXd arrayd n n matrix do something with the array ....... map array back.. was really your intention. The instruction Map MatrixXd arrayd n n matrix copies the entries of matrix into arrayd . It is..
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