Solving system with sparse matrices

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Carlos 2015-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/250055-solving-system-with-sparse-matrices

关闭： MATLAB Answer Bot 2021-8-20

Hello, I´m developing a code in which I need to do the follow operation: r=K\F, where r is a vector of displacements, K the stiffness matrix and F a vector of forces. Since the system is very large, I have used the sparse function for K and F (many of their elements are zero). I expected to obtain similar results doing: r=K\F; or K=sparse(K); F=sparse(F); r=K\F; However, I don´t obtain the same results (indeed the variation is very remarkable). Does anyone know if the there are limitations for using the sparse function? Thanks in advanced.

Carlos