[eigen] How to create a Matrix<...> without copying data ?

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I have a matrix stored as a double* in columnsmajor format.

I would like to compute the LU factorisation of a part of the matrix (that

is, not the whole matrix, just a sub square of it) inplace, ie I do not

want to copy data to an temporary buffer.

Is it possible using Eigen ? I saw that PartialPivLU class copy input

matrix when constructed...



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