V0.2 Solver Error: Compressed Residual #111
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This pull request aims to compute the compressed residual of linear system. By this we mean that for a sketching matrix$S$ , coefficient matrix $A$ , constant vector $b$ , and solution vector $x$ , this pull request computes $|SAx - Sb|_2$ . This computation is very important for the computational importance of kaczmarz where computing the full residual is more expensive than an update. This pull request includes: