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_Frankie

Underdetermined linear equation system

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I would like to solve an underdetermined linear equation system. I read about the LQ decomposition. Do someone knows, if there is an implementation of the LQ decomposition? I searched but didn't find code (C). Is there another approach to solve an underdetermined linear equation system? Thanks a lot!

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A SVD decomposition should get you what you want. You can easily compute the null-space/kernel from it, which is most likely what you are asking for. Link to SVD. The Numerical Recipes in C book (chapter linked of wiki page), also provides code.

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