Re: [eigen] help: eigen cann't solve this simple ax correctly, but Armadillo c++ can

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Hi there,

could you be more precise: how did you try to solve your problem with Eigen? How do you know/check that the problem is not solved correctly ?

Best regards,
Adrien Escande

On Tue, Sep 8, 2020 at 12:55 AM ztdepyahoo <ztdepyahoo@xxxxxxxxxx> wrote:

Dear sir:
   The matrix is generated from the spectral method of a simple heat diffusion problems, the dimension is 841. 
Attachment please find the a and rhs output from Armadillo. 
    I am wandering why eigen's dense linear sover cann't solve it correctly.

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