Fix Eigen iterative solver lifetime problem#91
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iiiian wants to merge 1 commit intopolyfem:mainfrom
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Description
Eigen iterative solver stores a reference to input matrix A and expect it to remain valid.
See https://libeigen.gitlab.io/eigen/docs-nightly/classEigen_1_1IterativeSolverBase.html#a3b0d9691964793bd55937666426fefbf.
Currently we do not make a copy and this results in segmentation fault when A is destroyed before the
compute()call. This PR fix this by manually copying A.An alternative solution is to have a API with clear lifetime expectancy.
Changes
factorize().